Actually there are several versions of the Creative drive, one is a Plextor and one is a Lite-on. If you have the one that people say are "based" on a Plextor then you have a Plextor. They are the same drive, the only difference is the printing on the faceplate. The TDK and Iomega 12/10/32 drives are also Plextors, I know, I have one PLextor12/10/32, one TDK 12/10/32, and two Iomega 12/10/32s and they are all exactly the same drive. Beware, the later Iomegas were Sanyos.
There is no such thing as a Plextor OEM drive or a drive that is based on a Plextor, there are only Plextor drives. I spoke with a tech rep at Plextor and he told me without really telling me that they made these drives. The only difference between these drives is the printing on the faceplate (well, on the TDK the whole faceplate and tray are different but the rest of the drive is all Plextor), and the ID sting that the drive reports to the BIOS and the OS. All the firmwares from these companies are based on Plextors with the ID string changed....you see where this is going.
You CAN use a Plextor firmware on any of these drives as long as the ID string of the drive has been changed. To learn how to do this go to http://www.roundsparrow.com/comp/iomega1/FAQPlex1/ for an explanation. There are also files you can download to change the ID strings of your drives, except for the Creative drive, but I would bet if you got in contact with the webmaster he would write the program for you, I asked him for the TDK one.
I have succesfully changed the ID strings on my two Iomegas and then used the latest firmware from PLEXTOR on them. I then benchmarked each of these drives using CDSpeed99. Both had identical mirror image reports of my "Plextor boxed" Plextor. I have not done the TDK because they keep up with Plextor on the firmaware revisions, but I think I will soon to take advantage of the multiburner support showing up in all of our favorite burning ROMs.