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I've been using an AustriAlpin autolock carabiner with my Gri Gri 2 for around 9 months, a few times a week (1 to 3 times). It's a very solid, robust and big carabiner, which means that's not too smooth in Gri Gri's hole, but IMHO, it's way far from being retired. I had been told that if a carabiner is used with a Gri Gri, it should never ever be used with any other device. I do understand the concerns, but I've been googling this, and checking Petzl's site as well, but I don't see any evidence on that.

Now my issue is that I have just bought a Mammut Smart Alpine and a Grivel auto-locking carabiner. I love this Grivel, and I like the Mammut Smart as well, because it's smoother for lead belaying, yet has some assisted braking in it. However, there are two issues with this set:

  1. Grivel biner [despite being labeled as red] is pinkish purple with a gold gate, where Mammut Smart is gray and red. The color isn't matching and I'm a bit annoyed at this!
  2. It's somewhat curved on the wide end which means that Smart can't fully sit in it. I haven't tried them yet, but I feel like the Austriaplin biner fits Smart better, and then I won't have the color mismatching problem!! (though the set will be heavy again (I don't mind it for indoor use, but I still do like to use this Grivel!)).

Any clues on this? Shall any biner used with a special belay device, marry it and stay with it forever?

the two sets

Austrialpin and Gri Gri

the tiny bit of wear on Austrialpin's corners

Grivel and Gri Gri

Austrialpin & Smart

Grivel & Smart

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The reasons for this recommendation are the same as with the recommendation to never use the rock side biner of a quickdraw with a rope. In both cases there is metal-metal contact. This leads to scratches and in the extreme case even well visible and sensible creases. In the latter case it is very clear that you should not use it in contact with ropes. Unless it is a rely big and sharp crease, you will never get it to cut a rope in two, but it will seriously damage it over time and you will ruin a good rope, that is much more expensive than a biner. If it is just light scratches (and they are always present), it is a matter of debate. As there is no rigorous testing done and published (at least none I am aware of), you can't give a definite recommendation either way.

My reasoning about lightly scratched biners:
For occasional use I do not think twice about it. If a am mountaineering and the biner I grab first to do a Munter's belay is scratched, that really does not matter. For regular use (sports climbing) I use unscratched biners, i.e. biners I do not use with a Grigri. In my case this is not an issue, I have much more biners than Grigris (1). Even if you don't, consider the price of a rope against the price of an additional biner, which you will need anyway if you will ever climb outside of a gym or a perfectly equipped climbing crag.

About your particular case:
As a big part of your reasoning is matching colors, so I dare say money is hardly the main concern. So just buy a matching biner for both devices. Like that you are both perfectly fashionable and safe.

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    @Neeku I hope the last paragraph comes across right: There is nothing wrong with your question, it is very relevant. But matching colors in any mountaineering equipment whether intentional or not is a standing joke with my friends - I just could not resist. – imsodin Sep 9 '16 at 22:41
  • I know @imsodin! But most of climbers are so careful about matching everything that I sometimes feel intimidated by not doing so, especially being a female!! Silly I know... – Neeku Sep 9 '16 at 23:06
  • Also, I assume your answer about rope against metal is when it passes through Smart? Because I find Smart quite rough on the biner especially at the event of catching a fall. And last thing, any comments on using a specific shape of biner with Smart? The manual doesn't document much in this regard. – Neeku Sep 9 '16 at 23:08
  • About the shape I had to ask a friend, I do not use the Smart, and I am currently away. I saw climbers using Smarts with any kind locking biner. I don't see how the biner not sitting/fitting snugly is a problem, I guess it is anyway moving all the time while belaying. The contact area of a biner with a Smart in the event of a fall is on the "outside" of the biner, Is it not? In this case the rope should not wrap around that part and it is thus no problem. – imsodin Sep 10 '16 at 14:32
  • I tried belaying some kids with Smart today and it seemed fine (using the Grivel biner). Didn't catch any falls, but seems ok in general. – Neeku Sep 10 '16 at 16:06

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