Colour shift after export

Hi, I'm having problems with colours being shifted when exporting from AE. Please see attached:

- First image is the original colour in a composition ("Comp 1").

- Second image is an export of "Comp 1" imported back into AE. Colour has changed.

- Third image is a side-by-side comparison of the two. 

As you can see, there's a significant difference between the them. All I've done is create a basic shape layer in a standard 24p composition, export the composition, and import it back into AE.

Anyone have any idea what's going on?

Thanks