They may. But I don't think the G4 would boot from them. scratch that, I doubt it would. Mainly as there has to be a ROM on it.

Howerver, since I had an Adaptec with a PC ROM on it that was pulled from a Gateway machine. It seemed to be recognized by OS X, it just wouldn't boot from it.

Reading and writing from the SCSI Drive was not an issue though. It was able to store data, and had no errors.

I would say, if there was a chipset equivalent on a mac card, I am betting a PC Card sharing the same SCSI Chipset would work.

Go ahead and try it.