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2 of the 4 terminals on the replacement are duplicates of the other 2. With a DMM you will find that there will be 2 pairs that always have continuity, and that when pressed all pins will have continuity with each other.
Essentially it is a SPST with extra terminals....
If the mech can deal with the switch not being centered you could clip the duplicate pins and only solder 2 (if that works some superglue between the new switch and the board may be a good idea) ....Other wise you could possibly solder the duplicates together, and add new centered leads to go through the board.
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