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Great job Travis! It certainly sounds good so far. Although it still needs more verification, I feel very good about it being a drop in replacement. But I'd certainly want to at least get the factory CPU that came with the donor motor. Preferably i'd want unlimited access to the whole vehicle. To the OP, an engine swap can be an expensive rabbit hole. Because nothing is as simple as we'd like. And every project is way more expensive than it at first seemed. Before going down into it, be certain that it wouldn't just be easier to fix, rather than replace.

However, if i look at the parts list for the 2018 4 seater..... they use the same 409135 engine..... 2017

I found the part number of the engine, and according to partzilla the engine only fits these models This Arctic Cat 409135 I2 846 UTV NA-80 DS V003 2015 3.1 fits the following models and components: Arctic Cat Side by Side 2017 STAMPEDE LTD EPS INFERNO RED - U2017S2W1SUSN ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XT EPS BLACK - U2017S1W1SUSP ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XTR XT EPS FOREST GREEN - U2017S3W1SUST ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XTR LTD EPS ELECTRIC BLUE - U2017S4W1SUSU ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE LTD EPS BLACK - U2017S2W1SUSP ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE FOREST GREEN - U2017STW1TUST ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XT EPS INFERNO RED - U2017S1W1SUSN ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XT EPS BRIGHT WHITE - U2017S1W1SUSB ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XTR LTD EPS PLATINUM - U2017S4W1SUSV ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE LTD EPS PLATINUM - U2017S2W1SUSV ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE LTD EPS ELECTRIC BLUE - U2017S2W1SUSU ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XTR LTD EPS BLACK - U2017S4W1SUSP ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XTR XT EPS INFERNO RED - U2017S3W1SUSN ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XT EPS FOREST GREEN - U2017S1W1SUST ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XT EPS REALTREE X - U2017S1W1SUSF ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XTR XT EPS BLACK - U2017S3W1SUSP ENGINE - COMPLETE [302495] Arctic Cat Side by Side 2017 STAMPEDE XTR XT EPS REALTREE - U2017S3W1SUSF ENGINE - COMPLETE [302495]