I've swatched Swell Baby and Short Shorts next to a few other shades I thought that looked similar.
First picture left to right: Shroom, Dazzlelight, Short Shorts, Solar White
Second picture left to right: Solar White, Short Shorts, Dazzlelight, Shroom
Here you can see the golden duochrome of Solar White better in comparison to Short Shorts.
First row left to right: Tone: Grey (Tone: Grey Quad), Straight Hedge (Graphic Garden Palette), Hold my Gaze (Sorceress Palette), Essence Irresistible
Second row left to right: Swell Baby, Glamora Castle, Scene, Silverthorn
Third row left to right: Dianne Brill Metallic Lace, Knight Divine, Nighttrain, Stila Barbie Palette
Click here for a bigger picture (and more details) of the first Swell Baby comparison pic.
There's no other grey shadow like Swell Baby in my stash.