Am I right in assuming that Pan Euro calipers will fit my '91? I have found a set for sale and they look identical, but for the fact they are painted gold?

Yes as far as I know - look at the website www.mrcycles and compare the part numbers.
There are many parts which fit both.

I dont know how true it is but I have been told that the early Suzuki 600 Bandits have the same front calipers as the early 1000 canes.

Looking at the extensive research I have done, it seems, most early CBR6's up to '97 i think, most Pan's and early Pro Arm VFR750's run the same calipers, with both the Pan and the VFR using the same discs.