Actually, it looks to me like you can. The 2018-2020 sets have been based on a system where there’s one Technic pin at ground level and one elevated by five bricks, so there’re two attachment points. I’m not certain but I think that the ‘sideways’ attachment of the new sets also relies on the same technic pin system - at the very least the ground level one is the same. So worst case, only have one point of connection.
And, I mean, it’s LEGO. I’m certain it’ll be easy to modify them so that they are compatible if they aren’t already by default.
That's what I was thinking.