This machine has been in the weeds (literally) for at least 10 years.
It could have ben repowered however the wear (looks) of the frame looks that of the engine.
Pic from an ad, the machine is missing both back wheels, otherwise, about identical.
Really the question IS, (not is it a re-power), but that Snapper copied / made a Sarlo style mower.
(I'll try and get a pic this weekend if I'm up there working)