Here is the K4 V2/V3 keycap layout and size chart overview. The keycap is designed for the Keychron K4 V2/V3 keyboard.

Different rows on the keyboard have different heights and slope profiles and Keychron K4 V2/V3 keycap uses OEM profile with MX style. Therefore the K4 V2/V3 keyboard is compatible with other OEM profile keycaps in the market.