MOST of the time it just depends on the shape of the stem. like if u take a cap off ur board it'll look like a little cross and thats MX mount (the most common type) if the LEDs are facing north (relative to the keyboard) then some cherry profile keycaps will interfere and will not fit. theres also different layouts and sizes so you have to make sure the kit you want has the right keycaps for your keyboard (obviously the legends dont have to match, but you need the right size for keys like tab, ctrl, space etc)
P.S. most people wouldnt recommend those HyperX keycaps anyways