Well, if it doesn't have a connector like the DS2s, or a USB connector, I doubt it will work.
FWIW I had several MadCatz "dualshock2" knockoff controllers, because genuine Sony ones could not be found when I bought my PS2. None of the damn things worked at all, or if they did, they would only work as a single controller - not with the Sony one plugged in the other port. I think the MadCatz stuff just sucks.