OK here is the scoop that I was given as I have all 3 types
Red Stars - Cross between RIR roo & Delaware Hen - Have what appears to be a multi-pointed buff or white star deviding neck and shoulders.
Isa Brown - Cross between RIR roo & RIW Hen - Are a lighter red & Have Buff or light...
I have both red and black starsand they look nothing like them to me. Will try to post pics later when I figure out how. Just joined so may take a day or two.