Wow Thanks for that. I stopped working support over a year ago after nearly 7 years of emails and phone calls. I'm obviously behind the times!
So from what you've provided it looks as if the motors are now the same, just the controllers are different?
So if I read the Bafang site correctly the old destination BBSHD is now G320 and it's the only 750W version. Making the controller for 750w incompatible with the 01B 02B now labeled G340.