I know that there are several SLC PS (AC33) talk groups that are (permanently) patched over on the UCA (7202) system. And there are a few 7202 TG's that are patched over to the AC33 system. This would include some Regional and medical (LZ) Channels. Modern Dispatch Consoles have many wonderful capabilities, but I do not know if they can patch across systems.
(my two-bits worth)