I'm not sure if it is but its almost exactly the same as sharp from the tempting quad. The difference is the texture and I think Rated R has more sheen.
I dont have overgrown, but i have Rated R, and i love it. the texture is so smooth and is a really pretty color. Here's a swatch from the swatches for "love that look" http://www.specktra.net/forum/f217/m...l-09-a-142894/