I know that the DCS 400 series were made in both color and monochrome as well as both visible light and infrared variants. The most common will be the VL Color, followed by the VL Mono, then the IR Color with the IR Mono bringing up the rear.
Kodak also made the 400 series using Canon EOS-1N bodies, with all the same variations. Heck, the circuitry is the same, just the body was changed to protect the innocent.
When the models were updated to the DCS 600 (Nikon) and DCS 500 (Canon) versions, the IR models were dropped. By this time, the sales of the VL Mono units were falling off, so they only offered VL Mono on the DCS 660, and there weren't many of those made, either.
Finally, by the time they got to the 700 series, they made something like 80 of the VL Mono units. They were sold for industrial uses, and I know of only one photographer that bought one. He recently had it on the Rob Galbraith site's For Sale forum for $8000. I bet he still has it, too. Not that $8k was a bad price for a unit that was originally $11k only a year or so ago.
Oh, there was one other variation in the DCS 400 line. The DCS 465. This was a medium format back for 'Blad bodies that used the same electronics as the DCS 460C. As far as I know Kodak only made this one in the VL Color variation. It was replaced by the Pro Back line.