The one on the left always had the tail out and flashes his private like it is London Fashion Week. I've lost count of how many times I've seen it, went on Google yesterday and his cloaca is similar to that of a male without a doubt.
As for the tortoise on the left which we taught was the male I genuinely can't remember the last time I got flashed as for the tail I never really paid a great deal. So for this tortoise I've uploaded some pictures of its cloaca.