1911 45acp Recoil spring

On 45 auto, with the same reload, changing the recoil spring from 16 lbs to 10 lbs could change accuracy and different impact position on the target?

Absolutely

Not to mention that if you have a round cycling a 16 lbs spring I bet it is hammering the frame with a 10

I don't think so my load is light : N310 3.8 gains on Sierra 185 gr.JHP

It will not change inherent accuracy at all. It will change recoil impulse and thus your reaction to it - that may change the print on target, or not if you are not recoil sensitive.

Barrel fit contributes how light of a recoil spring you can use and not lose accuracy. A poorly fit barrel normally needs a heavier recoil spring to keep the barrel in battery longer to get decent accuracy. A barrel that has properly fit bottom barrel lugs can get away with a lighter recoil spring. I’ve actually shot pistols that sprayed the target with lighter recoil springs. But when a heavier recoil spring is installed grouped again at 50 yds. You don’t really know unless you try.
Jon

You didn't say what the load specs were.
I've been dropping mine down (4.0gn Sport Pistol-200swc) in order to not get beat up with 180 rounds on match day.
This does allow me to change recoil spring to 10lbs. 
It will beat up the frame though, and should feel really harsh. 
Just my 0.02.

A too-light recoil spring can cause the barrel to unlock early; may also be compounded by barrel fit as Jon pointed out.  One indicator is usually vertical-ish stringing.  The line between mechanical reliability and accuracy is thinner with light loads.
Try heaviest spring with good reliability.
I did a lot of testing and found that light springs gave poor consistency.

I have also found that N310 is temperature sensitive, so I have moved away from it.  A cold day will cause all sorts of problems.  I love it because it meters well but I can't depend on it, at least for the light loads I use.  It is very consistent if temperature is moderate.

Jon is correct, it will depend on how the barrel is fit. Keep in mind the slide has the recoil spring and the main spring to compress to open yet only the compressed recoil spring to close it when opened. It must now work against the main spring that's pushing the hammer up under the slide and the next round being chambered. You might not completely close but enough to allow the disconnector to reset. You could have vertical stringing. Nor do I think changing he recoil spring that is working with the load using 16 pound spring to a 10 without changing the load. Not sure why you want to change the spring if you don't change the load because the spring will not change the amount of recoil yet probably change it from soft push to hard snap. When I determine the best powder/bullet combination that will result in best group size I then determine the best recoil spring that will allow the pistol to function yet not have the slide slam open. I don't like buffers, they limit the amount the slide can open! Putting in a light recoil spring might work but eventually cause problems.