Shift your focus from the ways the two relationships dont match up and instead look at and be thankful for these people as individuals. Do you not have friends you spend time with for different reasons? I have the ones I club with, the ones I'v known forever, the ones I share hobbies with. To me the people we are in relationships are the same. I don't compare my friends, I love them for who they are and who I am when I am with them. Same for partners. Love them for who they are, not for the relationship, they are not the relationship, they are people. Love them for what they bring to the relationship.
I believe in the power of thought. If you only look for the negative, that's all you'll be able to see. Look for the positive and celebrate that. Take it upon yourself to celebrate who they are and what they bring to your life as individuals.