Nortek is one of the largest manufacturers of Z wave devices in the US. They sell their devices under many different brand names, including linear, two gig, go control, and some devices for Lowes iris, Nutone, and other third parties. .
They’re all the same device and have the same model number, and if you look at the user manual it’s usually the one branded Linear.
The suffix literally just tells you what box the device is being sold in.