I think it is a reasonable comparison, there definitely are some differences in terms of writing and music but it still feels very Key to me and has the same plot structure as Clannad and LB (comedic common route, more serious romantically oriented character routes, true ending that incorporates the multi-route nature of the story) and although the soundtrack does feel a bit different in Rewrite, it still has the same general feel to me.
Personally Rewrite is my favorite but they feel similar enough that if people like Rewrite after I recommend it to them, I also recommend other Key works too.
