Yes, it's possible.
Here you can read the differences between daughterboards
http://amiga.resource.cx/mod/a3000.html
Interesting. I suppose a rev 5 daughterboard in a 9.3 motherboard would mean that somewhere someone swapped a rev 7.1 db with a rev 5? Or did they actually ship rev 5's with some 9.3 motherboards?
As for the rev 7 daughterboard, the site indicated that they were never released to users, but there are rev 7's out in the wild. So am not sure. Are these rev 7.1 in reality (even though they say rev 7 on them)?
So many questions to unravel the last years of C= engineering output on a shoestring budget and incompetent corporate management

Any enlightenment appreciated.