Tuning Are the 1377 and 2240 mods compatible with each other?

Hi lads, I want a good ''Mad Max'' air pistol for very small game/survival.

I purchased a pcp cilinder for the 2240:


The conversion seems pretty easy, but later I re-think the whole thing, in the apocalypse, Co2 bottles may not be easily available, they occupy much more space than pellets, plus, you souldn't keep a Co2 gun charged for long, so a 1377 may be better than getting a 2240.
With 1377 you have the pump option of the gun + the pcp with manual pump and a few o-rings to keep the thing going for years, also I prefer the .177 with low power figures.

But I already ordered the 2240 version of the pcp kit. My question is, will it fit anyways to a 1377? how much similar are the 2240 and the 1377? the mods for one can also be applied to the other?