Just to demonstrate a technique, you can also search for and download data sheets for tact switches. Parts like that generally follow a design pattern, so that even if you can't find the exact same part as specified by some particular manufacturer, you can apply almost any. You do need to verify it, but that happens automatically when your circuit works! Just don't guess like that for a circuit that can blow up! The worst that can happen with a pushbutton pin mis-match is an incorrect reading.