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For example, differences might include:
... probably loads more that I missed.
Remember, Google is not as sensitive to Keyword Density as some of the other engines, and a top position can be achieved despite a poor on page optimisation just by having good Page Rank and incoming text links.
There are so many variables involved in current algos that trying to extract the correct KWD from other peoples pages is fairly erratic unless you have a massive amount of time on your hands. Far better to run your own tests on domains you own, where at least some of the variables are a known quantity.