Most cordylids are difficult to sex. You will probably have to go by confirmation - ie. males will have larger, wider heads, while females will have narrower more pointed-looking heads. Also, if they're really young, they may not have reached sexual maturity yet and as such may not be exhibiting these characteristics yet. Also, femoral pores are not very diagnostic. Males will develop more secretions, than females, but to the best of my knowledge both have the pores and it's difficult to sex them using that characteristic. Check out this article for some information on other cordylids.
http://chicagoherp.org/special/garyfogel/art_of_cordylid_lizards.htm
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Matt Campbell
Animal Keeper, Small Mammal/Reptile House
Lincoln Park Zoo Chicago, Illinois
Assistant Curator
Wildlife Discovery Center at Elawa Farm
Lake Forest, Illinois