Looking for some advice regarding airbag light on instrument cluster and also ‘passenger airbag off’ light on too.

Ive had the car connected to VCDS and it’s thrown up 2 faults as follows.

13636096 - Supply voltage
U1012 00 [137] - Voltage too High
[Powersupply upper threshold exceeded]


10485833 - Internal Control Module Memory Check Sum Error
B2000 49 [137] - Internal electronic failure
[Electronic Control Unit Malfunction]

Would a replacement unit be needed and will it need component protection removed before I purchase a used one. If I can find one that is!!

Also it’s part number is 8k0 959 655 B. I’ve noticed some have other letters for last digit. Is it important to have the exact matching letter on replacement part no?

Thanks