I wouldn't bet on it. RS-xxx is a standard, but not for SCSI.
I think your best chance is analyzing the db25 connector... erm, while writing this, I come to think of it: Perhaps the drive works with a controller connected to the db25? For the scsi bus it does not matter where devices sit in the chain.... Only issue is power for the drive, which supposedly comes from the supra controller via the db37. But power is probably the easiest to fix. It's probably 12V and 5V. See if the drive has a molex connector and you see on what pins the power is, or where you can feed it in.