I would say different or completely different. I know for a fact that if I ever have twins I will use the names I like the most not names that fit twins. That's just weird imo like there are different criteria for naming twins and naming siblings.
Being a twin myself I know my parents didn't use a theme on purpose and I'm glad they didn't. They just used the names the liked when naming us. Although I do see a theme;
Caroline and Terése are both French, I don't think it's obvious at all. (They were also considering
Carolina and
Teresa which I think would have been more obvious)