Can someone help me tell what gender my Reeves turtles are?

The top two photos is one turtle and the bottom two are of the other! The top is currently named Jeffery and the bottom ,Olly. Jeffery is 4 years old in August and Olly is 4 years old in December so not a huge difference in age however, olly seems so much smaller than Jeffery! Based on information I have found on... show more The top two photos is one turtle and the bottom two are of the other!
The top is currently named Jeffery and the bottom ,Olly.
Jeffery is 4 years old in August and Olly is 4 years old in December so not a huge difference in age however, olly seems so much smaller than Jeffery! Based on information I have found on the internet , I would guess olly (bottom) could be female due to the tail being shorter but I’m finding it difficult to find anything else to determine the sex that in internet has suggested.
Thanks for any help in advance!
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