There’s a guide for NA2.20 on 3.0, but it specifies the maps are ESN locked so you would need a license → Tutorial: Sync 3.0.20204 with 2020 NA2.20 Map Installation
My maps are from 2015/16 I think, I’ve used them a couple of times, mostly just for testing purposes… They will work, even in the case of an emergency…
But yes, that’s a decision you will have to make…