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Just looked into all this. Apparently the latest trackpad is trackpad 3 woth product code mk2d3z/a

The a1535 might be something to do with the battery
 
https://www.***************/apple-magic-trackpad/#:~:text=Talking%20about%20“How%20many%20versions,third%20is%20Magic%20Trackpad%203.
 
Not according to Apple. I looked into it and they're saying MK2D3Z/A is the latest. And if yours is this model number and has rounded corners, then this has to be it 🤣
 
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