Is it alright to give 4 1/2 week old pups some puppy butchers mixed with there royal canin starter. It does not say on box what age to give.
Can anyone advice please.

no problems.

My pups are already licking mums food and they're not 3 weeks yet.  And it is almost exactly what you are using.  Royal Canin mini junior and Butcher's puppy.  They love the trays, and I'm going to try the small tins of puppy.