Index and ring finger: two coats of Bangle Jangle
Middle and pinky finger: three coats of Lilacism
As you can see, they are quite different, much more so than I originally thought from just looking at the bottles. They both have this nice, muted quality to them but Bangle Jangle is quite a bit darker and doesn't have the pastel hue to it that Lilacism does. They are both cool-toned lavenders but Bangle Jangle has a lot more grey in it. Formula-wise, Lilacism is the more sheer polish and I had to use three coats versus Bangle Jangle's two. Lilacism is not as runny as I remember it being though and I didn't have any problems with it streaking, which can tend to happen with pastels.
I originally didn't get Bangle Jangle because I thought it would be much closer to Lilacism than it actually is. Bangle Jangle is definitely darker on the nail than it appears in the bottle. If you already have one of these polishes, I feel there is a distinct difference between the two shades to justify owning the other one-and I like them both! I'd say they are like cousin polishes, but not close enough to be sisters; one is the spring version and the other is the winter version. :) I hope my first comparison post has been helpful!