Catalytic converters contain much less common materials than anything in the battery or motor of EVs. This idea EVs are harder to make than ICE cars is nothing but FUD.
NiMH batteries in old hybrids used Lanthanum and BLDC motors use Neodymium, but the former was never used in mass-produced EVs and the latter can be supplanted by either AC induction motors (like in early Teslas) or, more recently, switched reluctance motors.