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 keycap uses OEM profile with MX style, and Keychron K4 V3 keycap uses Cherry profile. Therefore the K4 V2/V3 keyboard is compatible with other OEM/Cherry profile keycaps in the market.