Neosho Smallmouth have a prominent dark spot on the rear of the gill cover. The jaw extends slightly farther back then a northern smallmouth, almost reaching the rear of the eye. It is mainly found in tributaries of the Arkansas River in Oklahoma, Arkansas, & Missouri.
I can't tell from the photo where the mouth ends but I don't see the dark spot on the gill cover. So I would say no, its not a Neosho Smallmouth.