you can connect more than one Master (here[emoji14]rofiLux) to the same PAB bus, but they must be in different PAB groups, otherwise there are collisions
each PAB master has its own slaves in its group, slaves can't be shared
the advantage is:
you can access all masters trough one master, e.g. LAN or USB communication is tunneled through the PAB - then you need to use different device addresses (which are here the PAB groups) in GCC