I believe the only difference is the cosmetics. Lincoln as well as Miller made & still make machines for other companies & simply put their graphics & name on them. I'm sure this is the only real difference. Redi-Arc is a HUGE equipment rental company & has many manufacturers make equipment for them specifically with their color scheme & graphics. Kinda like a grocery store will have certain companies make their brand name products for them & simply put their name on it instead of their own. Redi-Arc buys hundreds of machines at a time & likely has a rental/resale contract with said manufacturers. Hope that helps. Steve.