Hey Maxim, welcome to the forum!
The Revit connector is not capable of creating Revit families from scratch and so cannot be used to downgrade families (with the exception of blocks coming from Rhino, which can be received as new families from 2.16 onwards).
Families are currently matched by name on receive, or you can manually load them, if missing.
We’re looking into the possibility of creating systems families automatically (like walls, floors…), is this something you’re interested in?