Yeah I'm going with the 50/50 chance lol.

As males grow older their plastron tends to be concave and the gulars get longer than they do on a female. Females have a totally flat plastron.. that's what I see on both of yours so I dunno. I've heard for years that they need to be 12 inches long or longer before you can really start to tell the diff.

Good luck with having two big ones though, we have one big sulcata, she's more than a handful.
-----
PHRatz