Hey, everyone. I have a 5,1 with what I'm pretty sure is a bad CPU tray. I do have a line on an affordable Mac Pro 4,1 tray with 2.66GHz CPU, and was wondering whether it would cause any issues to swap that try in just to get back up and running? I know it's relatively easy to flash from 4,1 to 5,1 for upgrades, but am concerned it may not work in reverse... Thanks in advance!