I'm running into similar issues trying to update my Mobula7 from Betaflight 4.3.1 to 4.4.2 also using a Radiomaster Zorro. My original diff all and after update diff all are quite different and restoring mostly complains about the following:
# resource PPM 1 A03
###ERROR IN resource: INVALID RESOURCE NAME: 'PPM'###
# resource PWM 1 A02
###ERROR IN resource: INVALID RESOURCE NAME: 'PWM'###
# resource PWM 2 A09
###ERROR IN resource: INVALID RESOURCE NAME: 'PWM'###
# resource PWM 3 A10