In many cases, I see that.. Two couples I know who are great with each other sort of resemble each other too. My parents OTOH, who've been together 40 years, don't. But then, where they aren't compatible, they brush it aside and made it work in other ways. So I see that as valid too. Not sure if I see it as ideal as the first type of relationship though (and that's sad saying that, since it's my parents), since it's a lot of hard work. Every one goes through hard work and all, but some people are much more unconsciously accommodating for each other.