The Catholic church’s Eucharist is sort of a secret. That is why potential Catholics are asked to leave before it starts. My understanding is that, from the earliest days, we did not want people present who did not believe that we were eating Jesus’ body.
I’ve been to the Eucharist and all I ever heard was from friends, who didn’t know if I could be there, as I am not Catholic.
My response is always the same “We are one in Christ and denominationally different.”
Unlike LDS, who believe there are no Christians, as all who believe they are Christian are of fallen faiths and dark religions.
I see no difference between Protestant or Catholic faith wise.
Different practices but, no difference in how you come to God, our Creator.