clifford matrix rs brain compatibility

Hey guys, I've been searching but simply can't find the information I need, hopefully someone here could help me out. The brain of my Clifford Matrix RS III seems to have died and I'm trying to find a replacement so that I don't need to rewire a new system... Does anyone know if a Matrix RS 3.5 brain might work? Or potentially the RS2.1 (friend has a working brain in storage). Finding an RSIII replacement brain for this old system is proving to be very difficult, I haven't been able to find which brains might be compatible. Thanks in advance, sorry for being so needy in my first post!

Some of the connectors on the RSIII are different from the 2.1 and 3.5. but the wires are all the same colors. if you have  the full harnesses to go along with the new brain you can make some quick connections for the ones that dont plug in. Also the remote you have from the RSIII will only work with the 3.5.

Or you can send the RSIII brn to DEI. Cliffford has a lifetime warranty