Yes, sure. When your hair grows back it will automatically be as it was earlier. i think this is very commonly problem. Once it grow, again recover their original colors .actually new hairs grow with their natural color so I think you should not take worry about your hair.
yes wonce the layers grow out and your hair is one length your hair will be back to normal. Jus like if you dye your hair. When your hair starts to grow you wont see color at the roots. The top of your head