Yung catalina birch mas ok yung drum hardware (tom holder, tom mounts, brackets -- just like the ones found on high end Gretsch kits) and drum heads. I believe Evans G1 coated yung sa snare and toms. I'm sure Evans pati yung sa bass drum, just not sure which model.
If I were to choose between the cat maple and birch, birch kukunin ko. I believe pareho na price ngayon (or hindi nalalayo), even minus the free tom, imo mas sulit pa din yung catalina birch. Sound wise, I'm sure that there is a noticeable difference. But both kits should sound great in their own right