We did many projects using Stm32f105rbt6. Stm32f103ret6 now is cheaper with more memory and the pinout is the same. Can we use Stm32f103ret6 directly without any programming changes?
The major difference is USB peripheral that is not compatible and should change the software and so some Clocks settings at system level . Then the migration is straightforward and easy between parts especially on the Flash and memories .
