Nope, it' really a drop-in. Booting via Internet Recovery and running
diskutil list with the Terminal should show the blade as disk0, something like this:
Code:
/dev/disk0 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: *960.2 GB disk0
Btw, the current MacPro6,1 EFI firmware version is 430.140.2.0.0, so you have a EFI firmware update to do.
Doing a clean install of Monterey 12.4 via Internet Recovery should update your EFI automatically.