In the pan, they do look a little dupe-y, with Romantic Rose appearing a bit deeper. However, when swatched, you can see that, at least on my warm skintone, Romantic Rose isn’t really darker, but it is warmer. Naked Rose skews blue-pink when compared directly with Romantic Rose, which by comparison looks a tad peachy-pink.
I have not actually tried Romantic Rose yet, but Naked Rose is wonderful and one of my faves.
Additional link: Milani Blush Megapost.