This post includes dupe and comparison swatches for select colors from MAC’s Heavenly Creature Collection.
Laura Geller’s Blush N Brighten products have a similar formula and color marbling to the MSFs in this collection. Some of the swatches are for colors that are very similar and others are of colors in the same family, though they won’t be “dupes.”
There are plenty of colors out there that are similar but aren’t shown below, so if you have a color in mind that I don’t mention, run an image search for it. There are also tons of other people out there who do comparison swatches, so I encourage you to hunt around. 
MAC MSF in Perfect Topping, MAC MSF in Petticoat, MAC Heavenly Creature MSF in Star Wonder
Laura Geller Blush N Brighten in Sunswept, MAC Heavenly Creature MSF in Light Year
Laura Geller Blush N Brighten in Sunswept, MAC Heavenly Creature MSF in Center of the Universe
Laura Geller Blush N Brighten in Apricot Berry, MAC Heavenly Creature MSF in Ring of Saturn
MAC Sheertone Shimmer Blush in X-Rocks, MAC Heavenly Creature MSF in Earthshine
MAC Lipsticks in Ahoy There!, Lollipop Loving, Venus
This is such à fantastic post! Thanks à lot!
Thank you for this comparison post, it was really useful! Could you tell me if your Petticoat swatch was the base colour only, or was it including the raspberry and gold veins as well?
I only picked up a little bit of the deep pink color.