If the racks themselves are interchangeable i would rearrange them in a way that provides the best possible warm heat up for your juvies. [Example] Move juvies closer to heat source, move breeders away from source. If using uth use a dimmer and keep other heating arrangements unchanged. If using single heating device make a way so more hot air escapes from breeders and adjust accordingly. I don't think it would be too much of a problem tho. Thats my 2 cents. Goodluck and try your best!