They're the same. Maybe people couldn't decide whether to put the tabby bit or the calico bit first.
I'm pretty sure that, because they carry the calico gene, the predominance of females still applies.
Agree. But observe, some tabbies have a quite warm brown tone, it looks almost reddish. They can also have ruficism? - which too looks reddish.
But they DONT carry the red gene.
Ie, it happens brown tabby cats are believed to be also red; ie being torbies or tabicos.