Bit of help sexing these two

I have just got a new pleco and just need help sexing the new one and one I have.

At first I thought that was a tube picture on the top and thus a female.

The bottom picture has no noticeable protruding around that area. Best image I could get.

Any shout on what’s what ?

Thanks

Pics of the entire fish may help...

The images I have to hand at the moment -
If there is anyone for an eye for detail let us know

Almost impossible to sex, can we see a photo of the whole tank it looks like an interesting setup.