My games use the UA ranger instead of the PHB variant. The question did not previously come to mind, because until now my players either chose hunter or beast master, both of which have their variant in the UA. Now the question did come up:
Are the XGtE ranger archetypes compatible with the base ranger class from unearthed arcana?
The reason I suspect it might not (at least not as written) is the fact that extra attack got relegated to the subclasses (except for the beast master who now lacks it). I further assume that the XGtE subclasses where created with the original PHB ranger in mind which means they would suddenly be seriously downgraded because they lost the extra attack.
By compatible I mean:
Is it correct that I would need to add extra attack to assure that the class is balanced with other classes?
Are there other differences with a similar high impact that I would need to consider?
Clarification: I want to combine the base class (the part without the subclass which is common to all rangers) from the UA with a subclass from XGtE rather than one which is also from the UA.