No. They won't have the explosive heterosis as with the initial F1 pairings.
However, the results likely will be better than trying to breed purebred heavy breeds (and crosses). Your results will just be sporadic in appearance and performance.
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Two reasons:
1) The Colored Range Broilers are unparalleled in quality and flavor. I've built them up and explained the Poulet Rouge scheme to my customers, and they now WANT those birds. They tell their friends about them. Chicken day at the market is a stampeed to get my birds...
My best results have been crossing my Dark Cornish cockrel onto retained Freedom Ranger hens. The next best was crossing the same cockrel over my black sex links hens.
So, yes, you'll need to be doing hybirds if you want a decent meatbird. Even then, they won't be super. We grow our own...