Yes they are. I just put a 47t TT600RE sprocket on my 2000 XT600E. They are the same except for the number of teeth (47 is stock on the TT600RE and 45 on the XT600E).
The TT600RE and 2000 XT600E front sprockets also are the same. The TTR600 had a different sprocket and so did the early XT's, don't know the exact years.
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Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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