Sometimes the algorithms have such different structural aspects that levels *may* be differnt, even when set at the same values…. things like envelopes of verbs and multitap delays make the difference.
You can try adjusting the internal levels of the 2 presets until they both reach what you consider "the same "level
you can boost your signal level from your gtr amp/preamp when loading the softer one
you can use MIDI CC messages to boost Eclipse OUT GAIN, when needed
you can program your MIDI switching system with different levels IF your unit allows that