SRX plugins contain all of the XV 5080 VST waveforms but none of the XV presets. The JV-1080 also have XV waveforms but is missing hundreds of presets of the XV though.
The JV and XV don't include SRXs which is why Zenology Pro becomes interesting because it contains every XV-5080 patches and waveforms and can be expanded with the full SRX expansions library (named EXZ) and more.