[He's contacted a friend of his who is an Eastern Rite Catholic. His friend wants me visit their church. He says I can get the best of both worlds. I can have the Eastern Rite and be a part of the Catholic church.]
As an Orthodox Catholic you will have the Eastern Rite and also be part of the Catholic Church. You just won't be part of the papal (Catholic Church) and as such required to hold the dogma and doctrines of said church. You will be part of the ancient One Holy CATHOLIC and Apostolic Church you profess belief in everytime you recite the Creed in its original form. You will be part of that church that best describes St Vincent of Lerins definition of Catholic -
Also in the Catholic Church itself we take great care that we hold that which has been believed everywhere, always, by all. For that is truly and properly Catholic, as the very force and meaning of the word shows, which comprehends everything almost universally. And we shall observe this rule if we follow universality, antiquity, consent. We shall follow universality if we confess that one Faith to be true which the whole Church throughout the world confesses; antiquity if we in no wise depart from those interpretations which it is plain that our ancestors and fathers proclaimed; consent if in antiquity itself we eagerly follow the definitions and beliefs of all, or certainly nearly all, priests and doctors alike."
[They both truly believe that that's possible because the only real differences are in the Divine Liturgy lay out and not the actual dogma. ]
[ I don't know how I'm ever going to get him to understand that the Orthodox church is a lot different than the RC and that I'm NOT converting into Roman Catholicism. ]
Sounds like you already understand a lot more than either your husband or his 'Eastern Rite Catholic under Rome's authority' friend does. Especially about the faith you will uphold as an Orthodox Catholic. A faith that is defined in its dogmas and doctrines and not based primarily on the ritual or traditions it practices.
Those in communion with the Pope are required by that very communion to accept both his final authority and the doctines and dogmas that he professes, upholds, and protects. It's not what is on the outside that counts. IT'S WHAT'S IN THE INSIDE.
Remember - 'If it walks with ducks, talks with ducks lives with ducks, sleeps with ducks, AND CALLS A DUCK ITS FATHER...then its gotta be a duck. Even though it dresses like and pretends to be a peacock!