Yep! Pretty much. IMO not many differences in temperament, but if someone else would like to challenge that, I'd definitely be willing to hear their side and very possibly switch over. But energy requirements and size definitely. I guess temperament too, in the sense that a Spaniel Spaniel would be much more focused on a bird than say some Cavaliers are. Don't get me wrong, a Cavalier will still be very much interested in a bird or any small "prey" animal, but when it comes down to it, there's not much a Cavalier will follow up with when it comes to behavior