Flat design colour question

Hi there,

I have a question regarding flat design. What would be the best way to design working around strict brand guidlines? From what I have seen, there are a set of main colours used, (http://flatuicolors.com/). If a brand used a specific colour, should the rule be that the colour is best matched to the above link, or to match the brand colour?

Hope that makes sense.

Thanks!

Go with the brand specific color IMO!