Doesn't happen that often anymore--white used to be consistently smaller in most materials--no dye.
There's no specific colors that run smaller anymore, at least that I know of. Probably a slight variation in the dyeing process caused your problem. I'd say contact BCY and get a replacement spool, but Dyna 10 isn't on the market anymore. Force 10 x-bow material is supposed to be basically the same thing--that might work.
The solution, for me, was to add an extra strand of the smaller material to the bundle to even them out.
Chad