These are basically Chinese mowers and go by many, many names. Black Rock, Snapper, Landscaper Supply, Buyers Gold and Landscaper Pro are a few more. There are other names but I can't remember them all. At one time or another all of these names have appeared on these mowers and some still do. The basic mowers are manufactured in China by one company and then sold to whoever wants to buy them. You buy the mower parts and then add your own engines, spindles, trannies and tires.
They aren't a duplicate of any mower any more than an Encore is a duplicate of an Exmark. There aren't but so many variations you can have from the basic walkbehind mower.