The odds of such a thing are already reduced as DCS : (wathever) aren't fighters (assuming we are in a sub-sonic fight). If they do target something, it will be WVR, and as long as you see the target, its all about pressing release button, so i'll be pretty equal (a10c has multiple flare modes, so i'll eaven be better for DCS products sometimes). By exemple, in a a10c vs su-25t fight, both just have to put the target in the center of the hud to lock him, so it all comes down to missiles and aircfrat characterisics, wich are modelled properly for su-25 and a10a.