I don't know much about the CPS changer, but grey CPS2 boards = asian market
Blue = US
Green = Japan
Grey = Asia
Orange = Rental carts (I've only seen one of these on ebay, don't know the full story behind them.
As for the CPS2 suicide issue, yea it is a bitch, but can be dealt with. If you're decent and trust yourself with a soldering iron, you can change the battery yourself. Or you can get an IC extractor, remove the program romz, and send them to Razoola and he'll fix them to work without the battery for a small charge.
Of course I've been too lazy to do either, and now I'm thinking of getting rid of a few cps2 games.