I don't think so. I asked this question a while back and I don't remember getting an answer. I was puzzled about this too when I first started playing with things.

When I tried to apply the voladj and rdsfake patches first (back about Hijack v190), I found that the hijack patch then wouldn't apply properly. If you look at the actual hijack patch you'll see that most of the rdsfake and voladj code seems to be there.

Mark is probably the only person who can accurately answer this one.