Okay, I got this today since I couldn't find the other pic.
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Heritage BR and Production BR.
Heritage BR is larger, fluffier feathers, longer head, smaller comb 'cleaner' barring....AND more likely to go broody.
I've had lots of Production BRs, only every had one go broody. Nearly half of my heritage BRs have at least tried to brood. I know this isn't the case with others...but maybe it has to do with the hatchery line regarding broodiness?? Most hatcheries tried to breed that out of them.......