Not necessarily, Roc.
You have the choice to use/create routings between the 2 DSPs. If they are in series you can load a preset in A and THRU in B, so only A will process the sound and B will let it go out unprocessed. Or you can load 2 different presets and super_process the sound thru both in series. Or even send the sound to the 2 DSPs in parallel for different processing. The thing is so open to be mind_boggling.
For a starter on pads, try the presets in Bank 57 Shifters-Unusual…or Bank13 Films_Atmospheres.
And yes….when you load a monolithic preset, there won't be any choice for B as it disappears…eaten by the supermighty new configuration.