A pedigree is really the only way to know what bloodline/s your dog has.
A lot of people say such and such dog looks like one line when they could easily be completely wrong.
I'd say that the color of your dog influenced the other person's opinion on the Castillo bloodline.
If your dog was a lil' more toned, with a lil' longer snout and tighter lips... I'd say it look a lot like the Castillo I posted

Dirty is cute though