>>4434812
I recently tested RPX400 and Kentmere 400 together in XTOL 1:1 and they're definitely the same film. I thought the Rollei films were different for a long time as well, but it does seem it's repackaged Kentmere.

See pic: tight crops from test frames, RPX on the top. I can't tell any difference between these. The K400 negs were a bit more dense but nothing major