Yes there is nothing wrong w/ cross breeds, they are very pretty goats, and the girl looks pure! Both are really pretty, that boy may give you some nice colors, that's the downside of pure pygmies the colors are so limited.
If they were mine I'd call any kids pygmy mix. Seems so many people consider any small goat a pygmy, I think that is where the confussion comes from as to what a true pygmy looks like!