Anybody trying to do a conversion of SWBF2 maps will have noticed that the minimaps are usually wrongly-sized for BF1 maps. The solution to this was to resize the minimaps, but it was basically trial and error: I experimented first with the Theed minimap, by comparing it to the one in SWBF. Finally, I settled on what seemed to be the right resize and I got to work converting the BF2 minimaps to BF1.
Bear in mind that these are untested, so I don't know if they'll be off at all.