Donny,
Because I did own both the BK-7M and the BK5 I am convinced they are not the same. I did not keep the BK5 very long but regardless of what I tried it never sounded as nice as the BK-7M.

I sold the BK-7M because at the time Roland did not allow any of the OTS voices to be changed and saved. That has been corrected in later OS updates I believe. Also, at the time I did not know how to program my controller, a Roland A-800 Pro, to control the unit so I had to make changes on the unit itself which did not work for me during live gigs.

I actually have been thinking about buying another one. With the controller programmed properly all the needed controls would be right at the keyboard.
I think Don had his setup that way.

Deane