Also road deep section wheels are generally shallower and lighter than track deep section wheels. The Zipp 808 track set is 1805g, the 404 track set is 1655g. Since track cycling has no crosswinds (except some outdoor shallow track) and no rule limiting the depth of a wheel (road are limited to 65mm IIRC), track cyclist can go for bigger aero gains than road cyclist.
In sprinting, top speed is more important than acceleration. And top speed is limited by aero drag, not weight.