Yes, absolutely.

Grinds are identical, and minimal changes elsewhere. Fine to keep current specs if swing and conditions haven't changed.

Good question. I would say it’s better than just grabbing any grind and throwing them in the bag. For me, my SM10 to SM11 transition had me the same in my GW, 52.08F but went graphite shaft to match my iron set. My LW was the same, 60.06K but my SW changed from 56.10S to 56.14F. Interestingly enough, I used to play the 56.14F in SM8 so that could be one of the reasons I hit it well in the fitting. I like the confidence I get knowing my wedges are best for me from a full fitting. Now when I mess up I chew out myself instead of throwing my clubs.