I have never tried either of them but I think you can mix both into other colors but they work best for florescents here this is the createx wicked paint web site Wicked Colors UV Glow | Createx Colors™
I know you are just asking to mix white. The web site says that the base is brighter. But I am guessing that if you buy the base then it might change the color of the wicked white that why on the web site it says "sprays white" for the uv white. But that's just a guess. So I would buy both
I have the UV base it can be mixed with any color , The UV white can also be mixed with any color but makes it a lighter version of what ever color it is mixed with.