What is writter in the EFI partition ? In details

• I have a HDD(called HDD1) with some partitions such as EFI partition and windows 10 partition.
• I have another HDD (called HDD2) with only a EFI partition and windows 10 partition.

I would like to replace the windows partition from HDD2 to HDD1. (kind of restoration)

What should I replace from the EFI partition of HDD2 to HDD1 in order to be able to boot on windows ?

• Could you tell me in details what there are inside the EFI partition ? (the bit/sector start of the windows/linux/any_other_OS partition ?)
• Is there any unique ID for each windows inside the EFI ? (means just replacing the windows partitions/files is not enough)

I'd like to know the EFI system in a low level in order to know what is possible to do or not.

Assumption: The windows partition of HDD2 is same size or smaller than the HDD1's one.

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