How to migrate project from 64-pin device to 48-pin device within same family

[BTrem.1]

I've been developing motor control code on a Nucleo-64 G431 board (64-pin) but the target product will use a 48-pin G431. I'm trying to wrap my head around how I migrate my project from 64-pin to 48-pin.

Unfortunately, the existing project is implemented using the STM32CubeIDE V1.2, which I understand may make the transition more difficult.

Any and all insights appreciated!

[KnarfB]

Stand-alone STM32CubeMX has a function Alt+L "List Pinout Compatible MCUs" under Pinout & Config. > Pinout (easy to overlook dropdown menu). Don't know which version supports your MCU but the latest do.