Should there be a difference in size between english budgie baby and normal budgies babies?

The reason i ask this is because i was forced to give 3 normal (american) eggs to my english budgie hen, who was incubating 3 of her own. 4 babies hatched int total. however, two hatched the same day, and they are about the same size. I was wondering if at about 2 weeks old there should be a difference in size between them if they were one english and one normal.