yooo
Good question, let me make sure I got it right. So your asking if you buy the 72% bin, can it be just as good as one of the 76% bin ones?
Absolutely. It could for sure be better on air. On Ln2 though, the asic has more meaning so I'd place my bet on the 76% there. Keep in mind the difference could be minimal but still there, all gpus are so different really.
We chose 72% as the lowest for this for a reason. Those gpus are still very very good and all 72-80% have big potential. Higher asic has its value for sure in extreme overclocking for many reasons.
72% asic cards can still hit 2050mhz, I've done it. 80% asic card can fail to hit 2G, did that too

. Those cards are exceptions of the norm that i see tho.
Let me show you some data from the cards I tested on air.
We sample from each batch to check quality level. I tested 4 pieces 76- 80% asic level they did 1592,1578,1551, and 1532mhz roughly max firestrike ultra on air 100% clean 54-57c
So compare that against the 4 74-76% asic I tested that did 1578,1552,1539, and 1539mhz.
Then I tested 4 pieces 72-74% asic and I got 1552,1539, 1539,1526mhz.
So highest OC Mhz at default voltage trends downward with asic like this. I also tested some lower asic gpus(well below the spec for this special intro asic buy) 63-64% asic on kp980ti long ago. They went something like 1520,1500,1500,1483mhz. I would usually not bother with a low 60% asic card on LN2, but still useful testing regardless to see it as I already know the behavior and what to expect.
The ranges they are offering I think are 72-73.9%,74-75.9%, 76-79.9%, 80%+. You will get exactly somewhere slightly higher or lower in the group you purchase from.
80% are gonna have the best chance to be awesome on Ln2 and even air, but with air cooling results on these can be mixed due to leakage factors. These gpus are VERY rare as well, so extremely limited availability on 80%+ ASIC