advice on ebay laser looking to purchase one of the 60w lasers from ebay

advice on ebay laser
looking to purchase one of the 60w lasers from ebay and noticed some sellers have a “red 60w laser” and a “premium red 60w laser” and also noticed there are 2 different model numbers on different listing for what seems to be the same laser. K40-370 and K40-0750, anybody have any idea on the differences between these, all the specs seem to be the same.
Thanks

I have no idea I even asked the seller who had no idea