Hitachi pcb swap criteria

[helpless]

Two hitachi laptop drives differ in their MLC and P/N.
Model number and the first 2 lines on the pcb sticker match exactly.
Is NVRAM swap a must? Or it won't work even with NVRAM swap because of the difference in MLC and P/N?
It is a HTS541616J9SA00. The patient is not not with me yet.
Thanks.

[unknown]

Match pcb #, transfer NV-RAM

[pepe]

This sounds like an RTFM type of question.
These pcbs have MCU with internal ROM, you must match the rom version otherwise a whole bunch of problems will arise.
I am not sure if MLC or P/N has any relation to rom version to be honest. I never cared about those, just find the appropriate pcb in my drawer...

pepe