Some slight differances but hard to tell from a video. They alll sound great. I'm sure the B2 would be a whole lot less money and they were very well made. Hammonds are like pianos in that they all sound different. As my tech partner used to say you have to find one that " speaks to you and make friends with it" Thats rhe one you'll never give up. I've been avle to play a lot of them but the one I remember most as connecting to me was a Model A with Trek Preamp, Percussion, and String Bass thru a 145 Leslie. Went to a church in Queens NY and I still wish I had it. Church was a storefront and it flooded shortly after we delivered the organ ! It was on a raised platform so got taken out to the organists home for safe keeping.
Donny I agree as one of the big reasons I went with the BK9 was,its Hammond sounds. Run in stereo its very good.