Some game variants do allow face cards to be treated as pairs, even when they’re non-matching face cards. This is because all face cards are worth the same value, which is 10. As such, in many casinos, if you get any combination of a Ten/Jack/Queen/King, you could choose to split them. However, stricter house/game rules require that the cards be an exact match, so you’d have to have a King and a King, for example, in order to split.