You're really similar in some basic ways, and that fact is clear to both of you right off. Your lives and experiences are of great interest to one another, and you find that you actually have something to teach each other from your own lives. Your interests in life, though they may be different, are also of interest to each other.
You're right there on the sidelines, cheering each other on, when one of you has an important dinner function with the boss or accepts an award or takes on a new job... Whatever it is that each of you is interested in doing, you're both into. And however you see yourself, your lover also sees you in that same way, and gives you a lot of great mirroring and feedback that builds your confidence; and you do the same for them. If things move along nicely and your relationship is a long-term connection, you blend your lives more and more, taking classes or joining sports teams together or otherwise pursuing common interests. The only pitfall here could be in that things are so smooth between you, you start to take one another for granted. You both need to consciously keep your energy and enthusiasm up when you're together, to keep finding ways to stay challenged and engaged in the relationship.