Yeah, as Tugdial mentioned, the Rev 2 chips are not discreet.
They are PA397 ICs based on CEM3397... each chip has two Osc Waveshapers, the VCF Filter, and VCA amp mixer.
It not really feasible to swap filters.
If you're trying to get the filter to close down completely, you can try to route a Mod Slot with:
Source: DC
Destination: Cutoff Frequency
Amount: -24 (or somewhere around there)
I do this sometimes on Pro 3 to close down the SEM filter completely. Not sure if it will have the same effect on Rev2, as haven't tried it, but thought I'd mention it.