In short.... Yes!
Randall only have Single Channel Modules
Egnater have:
Old Single Channel Modules
more recent Dual Channel Modules (Channel A and B)
and just about to be released Single Channel Versions of their current dual channel modules.
I currently have 2 old Egnater single channel modules in my RM100 (Erect and SL++), they sound killer! If you put a dual channel Egnater into any stock Randall amp, then you can only access Channel A of the module (the less gain channel). You can have dual channel modules modded to access Channel B instead.
Alternatively you can send an RM100 (this is the only Randall product that this can be done with) to Egnater to have the circuit board changed so that it will accept and access both channels of the dual channel Egnater modules.
Hope this helps explain.
Cheers
Damian