We can debate "a few" and "a BIG difference", but your performance pages will show you what each knot of speed equates to in landing distance. Touchdown point is much more critical than speed.
misd-agin, I couldn't agree more and I was not playing down the importance of touching down at the correct point on the runway but merely pointing out that if you are landing in a tailwind other factors can also come into play. Also, if you have a few extra knots the tendency is to float.