It is a better pic! Sorry I am not sure, but someone else might. There are so many species and colours and many go under a few different names and L numbers (which they are usually categorised under).
I can only suggest this link at the moment, it is one of the best sites to help ID pleco's as they have hundreds of photos and you can search either by Common name or L number etc. It can be hard because the Alligator pleco goes under Rhino pleco in the list.
Just point on "Cat-elog" and the drop-down menu gives you all the different ways to search.