They both seem too young to start developing, but the larger, pear-shaped one does have a more prominent cloaca. The other one is vastly different in shape and I can barely even see his(?).
I have only had them for two-ish, nearly three months, and I'm assuming they weren't very old when I got them. They were more ADF sized then!

Is it too early to start seeing changes? Kind of how kids go through a little puberty at 11/12, but aren't fully developed until some years later.