I don't know why I didn't try MAC's blushes earlier. It was actually reading that Springsheen was the closest dupe for NARS Orgasm but with a better formula that prompted me to try it out. However when I swatched them at the counter I decided to get Peachykeen first since it was a bit pinker. I ended up caving and not much later going back for Springsheen though.
They look almost identical in the pan, but don't let that fool you, they are definitely different enough that you need both. As you can see from the swatches, Springsheen is much peachier with a golden cast, and Peachykeen is much pinker with a pink and golden cast. One reason I chose Springsheen over a couple other similar colors (Nars Orgasm and Too Faced Who's Your Poppy?) is that it isn't all that glittery, it has the golden sheen but it's not glittery or too "disco ball/glitter explosion" either. I like shimmer for a natural highlight since I don't use highlighter, but I don't want to go overboard. I've really been into peachy blushes lately and these certainly fit the bill!
I recommend getting either one or both, they are summer blush essentials, in my opinion! Especially if you are like me and don't want to or can't wear bronzers, I feel peachy blushes are the next best thing for a very summery look.
Top: Left-Springsheen, Right-Peachykeen
Bottom: Front-Springsheen, Back-Peachykeen