I wish I still had the original Nars blush to compare side by side for you, but I believe that this is a pretty good dupe. The only difference in my humble opinion is that Orgasm is slightly darker, but not something the non-beauty obsessed would probably be able to pick out!
I really like the smoothness of Pearlescent Pink and was impressed with the color payoff for the price. The compact comes with a small angled blush brush, but for me its too scratchy to use. I keep it in the compact anyway though because its handy for touch-ups on the go.
Do you own Nars' Orgasm? Do you think this is a pretty good match?