I know I sound like a broken record at times by repeatedly posting the same stuff over and over again, but that's because I'm constantly amazed by some of these plants.
So yes, I definitely and recently posted on this Euphorbia pulcherrima not long ago, and surprise surprise the bracts did eventually turned red. It is possible after all to keep some of the Poinsettias after Christmas and grow them outdoors because they might just give you a pleasant surprise. I guess we should never say never.
The variety on the right may not have scarlet red bracts, but the subtle reddish undertone is interesting too.