Royal Purple, a dupe for So Rich So Pretty?

I can across these swatches of MAC So Rich So Pretty at The Swatchaholic, and it looks miiiiighty similar to what my E.L.F. Royal Purple looks like IRL (as is the case with many purples, I had trouble capturing the full depth and richness of Royal Purple). I'd love to get my hands on a bottle of SRSP to test them out.

Does anybody have both, or know how these two compare?

BTW, welcome to new friends kittytokaren and Cyan of Blue Tape And Nails. Check her out!