Q6 and V6 size difference

I realized dimension difference for Q6 and V6 Ultra 8k. Is it a mistake, or what gives this? I thought they are ~ the same, V with one mount, Q with two, V is plastic, Q is metal, different keycaps, etc., but sizes are the same. Am I wrong?

https://www.keychron.com/products/keychron-q6-ultra-8k-wireless-custom-mechanical-keyboard

Size

• 137 x 446mm

Front Height

• 20.6mm (without keycaps)

Back Height

• 31.09mm (without keycaps)

https://www.keychron.com/products/keychron-v6-ultra-8k-wireless-custom-mechanical-keyboard

Size

• 149 x 447.9 mm

Front Height

• 24.7 mm (without keycaps)

Back Height

• 31.2 mm (without keycaps)