It's my understanding you have to find the 'right' hollowpoint design, something narrow enough not to hang on the feed ramp...which interestingly is exactly the same width as the one on my 75BD. I haven't seen a picture of the earlier models but it looks to me like the chamber has been throated on this 2010 version. My hotter LRN will probably suffice though, maybe some 'spensive Critical Defense or EFMJ.
I compared a couple more things tonight. The 75 slide fits on the 97's but obviously won't function. My Kadet slide also goes on but not far back enough. Don't worry, I wouldn't even consider attempting that sort of graft.
The 75 and 97 barrel lengths are the same.
The Witness 45 magazine is identical to the factory 97 mag, except the baseplate is slightly thinner, so there's a 2mm gap. Same body, same follower, same spring etc etc. $15 difference.
Machine gun shoot this weekend so I won't be able to test drive it until probably Wednesday. With the thousands of people floating in and out of the shop, I felt it necessary to get it before someone else got a shine to it.