I am finding that the greens tend to prefer 80 to 82 degrees whereas bristlenose seem to do best closer to 75 to 77 area. They could be kept together but not "optimally".
I would say it depends if your looking for them to survive vs thrive.
That’s really awesome news that you were able to contact someone with some success! Do you know what species your pair is? And what species the person in your FB group has?