Comments on your setup
Hi AmandaLyne,
I know that this is a side issue but a couple of things occur to me when looking at your setup; they have nothing to do with sexing or breeding your axolotls, but with keeping them.
The light on the tank is unnecessary for the axolotls; actually, axolotls do not like light. If you need the light for plants, you should have swimming plants to shade the water below, and lots more hides for the axolotls to escape from the light.
In summer you will also need to watch the temperature in the tank closely, because the enclosed lid - especially combined with the light - will trap heat and warm the water, which is also bad for the axolotls (their water temp should ideally be 20°C or below and anything above 24°C quickly becomes dangerous).
The gravel substrate is ok-ish but the little colorful pebbles are bad - they are just exactly the size to cause trouble in an axolotl's digestive tract.
Back to your topic, they both look female to me, or at least very well fed.
If you can't see enlarged cloacae behind the legs, or are unsure, then we will all just have to wait for your photos.
-Eva