I don’t know why you are talking about Orthodox religion over and over, it is not the theme. Beside of that Orthodox and Catholicism it is exactly the same religion with the same God, few different customs (only thanks to policy! cause bishops of Constantinople and Rome didn’t liked themselves few centuries ago) don’t change that fact. I repeat THE SAME GOD! Rest doesn’t matter!
Actually in matter of politics there is a critical difference. In Catholic tradition the most elevated position belongs to the Pope and bishops. Pope was the overseer of the kings and bishops had special exemptions.
In Orthodoxy the King or Tsar is at the pinnacle and patriarchs/bishops are expected to be obedient to him (with the exception of spiritual matters of course). For the Catholics the Pope is their Holy Father, Russians called Tsar - Batiushka ie Daddy (in England to smaller degree there is also tradition of venerating the monarch).