(Not Catholic with a big "C"...I s'pose technically "catholic" with a small "c"...as in part of the universal church)
But they are similar in essence, as both exalt their church as the supreme authority, each ascribing assured veracity to their head, while also making another source of revelation supplementary to Scripture and equal to it, and out of which they propagate traditions that are not derived from it.
Hey, as long as you below in One God the Father-Son-and_Holy Spirit, who came to save us by his one-time sacrifice, you're a Christian brother to me..