To my eye they looks like normal otos. You can google chinese algae eater identification as I remember a while back there are markings that are very slight but enable you to tell them apart. But IMO those look normal.
Oh and otos don't breed in captivity often. In fact there are only a handful of cases I've ever heard about. It's a real shame too because they are perfect for almost every tank.
On a slightly off-topic comment I almost purchased some incredible otos. Problem was they were just too expensive (~$10 a pop) and since otos typically have a high mortality rate I would have had to drop a lot of money for them. Still wish I had gotten some though. They were called zebra otos and are INCREDIBLE.
zebra oto - Google Search