OK, So let me get this straight. The hen needs to be close to the same color like the roo that you have behind her? This helps alot.
Yes he is a f1 also. She needs to be dark like that.
But, keep in mind that the purebred rhodebar hens are only single barred and cocks are always double barred. So cocks will always be lighter due to the double barring. F1 cocks are only single barred. They are not purebred but a stepping stone generation produced for the purpose of breed improvement.