[Shotimes] Upgrading from one "Premium Sound" amp to two JBL amps

[van Oss]

My 92 came with Premium Sound.  I am looking to add a little bass.  Recently
received some SHO JBL gear --- main amp, subwoofer amp, and subwoofer with
housing --- that I'd like to install.  It APPEARS that the JBL main amp may
be a direct swap for the Premium Sound amp.  The plugs fit and, so far as I
can determine from the EVTM, the connection is a direct swap.

Does anyone know otherwise?  Any tips?

Joseph van Oss