The parts diagrams for all years of the Pro show the following parts:

Engine Mounting: #5: 4110174: Switch, Temperature
Cylinder, Head & Exhaust Valves: #2: 3240223: Switch, Thermo, 82 Degree C

Why did Polaris have the same part listed on 2 different diagrams, with different part #s?
I also see that some part vendors have also listed part # 2203221 as a substitute for 4110174.

Does anyone know anything about this? Are all 3 parts interchangable? Are there any differences between them? They all look like the same part when I look on Ebay, but some of these do look like they have a chrome plating as opposed to being solid brass.

Any insight would be greatly appreciated.