If they are on the same system, of course.
If they are on different systems I am not too sure. I don't know if the 528 (Uniden built) locks on to the first CCh and stays there like all the other Uniden built scanners or if will search multiple CCh's like the GRE built ones. However, even if it does, you run in to the TG crossover problem. If two systems are using the same TG number you will not know which is talking since only one will display.