The two concepts cover different behaviors. If your partner is getting attention from random strangers, and you think "my partner doesn't want this attention, I

The two concepts cover different behaviors. If your partner is getting attention from random strangers, and you think "my partner doesn't want this attention, I'll put my arm around them to make it clear that they're with someone": you're being territorial. If your partner says "I like and trust this person and I'd like to sleep with them" and you say "absolutely not", I'd call that jealousy.