splais, the only thing I have seen different is one is red and one is blue lol. The H1R says 50:1 or richer, and the MC-1 says 50:1 or leaner. So, in theory if you ran both at 50:1 they should be the same, I have both of them, havent tried the H1R, maybe I will try that or the redline I have in my 157 when it finishes its break in.