As you can see from the swatch, there is a difference between the two; Aquadelic is brighter and more teal while For Audrey is a softer, dustier blue. The difference was more apparent in person.
Formula-wise, For Audrey was a bit streakier than Aquadelic, though they both went on alright in two coats. As I was removing the polish, I noticed that Aquadelic definitely stained my nails - however, it's worth noting that I didn't use a base coat for the swatch.
|Base & top coat:||Base - none|
Top - none
|Polish used:||China Glaze Aquadelic - two coats|
China Glaze For Audrey - two coats