If Matt@ eastwood tells/ admits the welders are from another company, but meets Eastwoods standards. then everyone would undercut eastwood/ by that point he would most likely be out of a job
they are very likely the same welders. as oldred stated, they could specify better parts like capacitors and semi conductors just as matt@eastwood mentioned..
but any way you look at it. 2 years more of warranty is worth $50 no matter what