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The one on the right, just for the sake of discussion (is it Fantasmic's pic?) has some color in the dorsal fin. True SAE's don't. The one on the right is a bit blurry for me to tell anything else.
SAEs don't have a black stripe that runs through the tail. It stops just before the tail. I'd almost say the neither one is a true SAE. The one on the left seem to be very you and doesn't have it's true colors yet.
Common names can be so confusing. If we're talking about Crossocheilus siamensis which is the true SEA then yes they do have a black stripe through the tail. Your fish on the left is a true SAE as I see it. I hope I'm not violating any group protocol but I found some pretty good pics of various algae eaters at http://groups.msn.com/LyreTailsAquarium/sae.msnw
It's a good side by side comparison.