no, but a 15 spline OMC prop will fit an 800. The 400 had 13T splines as did some Cobras behind 2.3,2.5 and 3L. All V6 and V8 Cobras as well as later 3L used the same 14.25 dia, 15T props as 800 series. Some large V6 V8 J/E outboards shared the same props.
But, just use iboats prop finder with your engine year and model and it will hook you up for the best price.
after all that nonsense we still have a 3 minute edit notification. holy schmokes.