Yeah, the 24gr loads for .204 are fkn fast (flat) over the first few hundred metres but that drops off.
With the 204 you wouldn't bother with 24 or 50 grain bullets. It's designed for 32 to 40 grain bullets and those weights will always produce the best results.
The 204 will shoot flatter than the 223, even at the same muzzle velocity, because the longer bullets for weight have a higher ballistic coefficient, same as 7mm-08 vs 308, so on so forth, and that is the point of going the 20 cal over .224 for small game.
I don't need ADI data to know this as I have owned, reloaded and shoot both, and the 204 wins every time.