This was my first EE last year: (she is the yellow chick to the far right)
she had slightly darker legs at 3 days and they got gradually darker until they are clearly green now.
This is Lily at maturity. She lays a green egg.
This is one of this years' EE chicks:
and the same chick a couple of weeks ago at about 15 weeks.
They were both pretty much yellow at hatch with darker legs. Hermoine (this year's chick) had some slightly darker feathering on her heade and upper neck, though.

she had slightly darker legs at 3 days and they got gradually darker until they are clearly green now.

This is Lily at maturity. She lays a green egg.
This is one of this years' EE chicks:

and the same chick a couple of weeks ago at about 15 weeks.

They were both pretty much yellow at hatch with darker legs. Hermoine (this year's chick) had some slightly darker feathering on her heade and upper neck, though.