They look very much alike. I thought Red Blooded had a gold edge.

I don't grow either, but in photos both show a gold edge, more even than yours show. Red Blooded is supposed to be about 30" tall, with Red Bull about a foot taller, according to the stats I saw. Unfortunately, no one ever informs the plants what is expected of them, and lots of reports of short daylilies this year. Just to make you crazy.

For what it's worth, the edges in the lower photo do appear to me to more "crisp"; the transition from red to white is better defined than in the top photo. Also, the edges in the bottom photo have more white in them than do the edges in the top photo.

Well, they are brand new. I do see a definite difference in the sepals. I'll just have to keep waiting for future blooms to compare. Maybe if I get hot weather rebloom on both there will be more development of the edges. It's just so blah and overcast here now. I think it's making me very tired.

The stamen look different also, but might be a lighting or one time effect.