What's the difference between CL-171S and CL-181S?

What's the difference between CL-171S and CL-181S?

Both of  the model CL-171S and Powder coating equipment CL-181S are the new machine in COLO from 2016.

When we make the promotions , some client ask about the difference. In fact  the system and function 100% same ,except the front plate of the control unit .