It's certainly "fused" alright! You can see one cross head screw and there will be one on the opposite side. They are countersunk and the holes in the switch have a brass insert. Attack with a wire brush and then spray with Plus gas or similar penetrant. WD-40 as last resort. Screws should come out OK if you use the correct size screwdriver.
I've never used or had the alloy-bodied type but I think they are interchangeable. The round steel ones can have the wires held in by grub screws or having a female crimped end to match the male on the switch. You may have to cut off the crimped connectors and strip back about 3/8" to connect to the alloy type.
Bottom line, is your current switch not working? They are pretty tough and generally reliable even after all this time.
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