As @Jared points out in the comments, differences in the color of lightsabers between the Star Wars episodes, can be attributed to post-production. There is no canonical (in-universe) reason for these color differences.
For example, and taken directly from the question that Jared linked to...
...before the last edited release on Blu-ray in 2011, it was made green (on the 2004 DVD edition). More than likely, if you are watching a copy of Star Wars that was released before 2004, you will find color differences from scene to scene. The 1997 Special Edition and original version, the same lightsaber in this scene is white.
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