The voices are still very squeaky so it is not quite obvious yet. :jumpy the heads seem darker than the bodies on both of them. The bottom one is a little younger (a few days) and still has some down on the head, that might be making it look paler in the picture.
(It is quite exciting to keep...
they are now 5 weeks old (one seems a few days older)... When they were newborn someone said Kaki Campbell (I believe that was a correct) can we say boy/girl now (and safely name them ;) )