There can be slight differences. Oftentimes knockoffs can look good, but the test is in how they perform and last.
I have a Dayton combo shear, brake, and slip roll that I got at Grainger 20 yrs ago. Paid a bit for it. 5 or 6 years ago I saw an almost exact machine ar HF. The price almost made me lose control of some of my bodily functions right there.
I still dont know if they are the same or not.
Bottom line is are they worth what you paid for them to you? If you enjoy them, cool. If the price difference eats at you, better unload them. Nobody needs more stress.
Chilly