It *is* hard to strike a balance! My husband and I have similar approaches toward life, and we sat down and discussed general parenting philosophies before we decided to get married. I knew we'd have moments of disagreement, but there are areas where our approaches are so wildly different that we frequently have to discuss what we each think is going on and how to handle it.
In particular, I'm much more lax than my husband. I was raised with the idea of nurturing your child's innate creativity and fostering their self-esteem (perhaps because I'm more sensitive?), whereas my husband, being more certain of his own self-worth, doesn't feel that this is necessary and places more emphasis on obedience and self-discipline. Until we were married, I didn't even realize that "obedience" is a dirty word amongst parents of my corner of the US. We say things like, "you're not listening", not, "you're not obeying me".
I'm lucky in that we've made a routine out of regular check-ins with how the blended family is going. He's also willing to defer to me, since I know my child better and have more experience parenting her, but he also feels free to speak up about what he thinks needs improvement. My problem comes when I don't want to disagree with his approach while it's happening - i.e., he thinks she shouldn't be allowed to do something and tells her so, but I think it's ok and/or have allowed her to do it in the past. I don't know how to intervene without making my daughter think I'm in opposition to my husband.
Overall, I'm really happy with how the adjustment is going. I think a lot of it was just getting used to each other - and for my husband, seeing how to parent on a daily basis. (Remember how we all knew how to parent perfectly before actually having children? He thought he did, too.) But the best part of all is that his actual parenting strengths are in areas that he totally didn't expect... as I imagine the rewards are, as well. And when we decide to have more children, well, then he can see parenting from every stage, and every angle. I'm looking forward to it.