If you swap just the hard drive mechanism, it should work. The controller will be different--the ROM in particular.
There really isn't an Apple SCSI vs. Standard SCSI. ANSI determines the SCSI standards, and Apple provides input to the standard. The problem is that SCSI is an evolving standard.
ANSI is the American National Standards Institution
This would not be an approved repair for an Apple Warranty or AppleCare.