I'd recommend to contact Hasselblad support directly.
That will not work. First, there is no "Hasselblad support". You have to go through a dealer who, as a general rule, did not test all possible body-back pair. Second, the Hasselblad company themselves, in their available publications, are somewhat inconsistent as to what works and what does not. For example, mounting an H3DII-50 back on an H4D camera should not work, but it does (at least for the last firmware version).
I am sure that there are a few engineers in Göteborg who know, but we can't contact them. I am afraid that there is no other way to know than testing.