I just tested the new ones in RE and agree the different was rather big, these newer ones now had that "MB Profiled" quality & trademark to them. The biggest difference seemed to be in the cabinet side as those older ones came alive with the cabinet in the newer version. I recall there were some issues that pressing "merge" changed the tone in those earlier beta releases. Anyhoo, great work! I would offer these to Kemper team as replacement for the ones currently available through the Merged Rigs Pack (February 2015).
Then to the wishlist Bad Cat amps!! Would love to get especially the Lynx model (high gain, EL34, cathode biased) profiles from MB. I think they sound unique among the existing MB offerings.
Also some 6550 and KT66/77/88 power tube equipped amps would add value and versatility even further.