Correct, a SCSI drive is a SCSI drive.

For a while, I ran a circa-1999 10,000 RPM Ultra2 SCSI drive in an SE/30.

And there is nothing preventing a modern 15,000 Ultra320 SCSI drive from working externally on a Mac Plus, or internally in an SE or II. (For internal use, you'd need a physical adapter, since modern parallel SCSI drives use either 68 or 80-pin connections; but those adapters are just physical converters from 68 or 80 pins to 50.)