I'm not so sure those claims are entirely accurate. UUA is GregTech-specific, and the GT Replicator behaves very differently from the IC2 Replicator.
Also the ic2.ini has a quite different blacklist for the IC2 Recycler. There is no cobblestone in the blacklist, for example.
By the way: I couldn't find a blacklist for the GT Recyclers anywhere in my GregTech config files. Is that blacklist hardcoded or should I regenerate my config files for GregTech?