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I believe the the differences have to do with the way in which the Christian calendar was eventually built, so that Easter was not correlated to the Passover season, but to how the months and lunar calendar aligned.
Here is a short form of the explanation:
The Nicene Council (ended August 25, 325 A.D.) decreed Easter to be the first Sunday after the full moon following the Spring Equinox, March 21, unless that full moon fell on a Sunday (in which case Easter would be the following Sunday). In 2008, Easter is March 23.
Clicking on the links in the blog above by Bob Webb will get you to more detail.