I discussed similar stuff directly with a LAB rep back in 2023. Here's what he said:
"The balancing would be fine if you alter the grip, but depending on the weight of the grip, it could influence the swing weight one way or the other. With a lighter grip, the swing weight would increase while with a heavier grip, the swing weight would lower. "
He also said in most cases, swapping grips should be fine for balancing, but said if there's a larger 40+ gram discrepancy, it should be fine, "in theory"