The 86 600Z Tenere had an electric and kick starter. Before was only kickstarter. After only electric start. They also moved the air cleaner from below the seat to on top of the engine under the tank in 86. To keep the tank the same capacity without making it wider, they had to drop the sides. This brought the fuel taps under the carbs, so it meant they had to fit a fuel pump. It also restricted airflow over the head and cause some overheating issues, which included engine/head bolts pulling/stripping out of the crankcase. They addressed this in later models.
So although the basic design of the engine/bike remained the same, there are small differences which could lead to compatibility issues (e.g. slip gear, starter, engine bolt lengths etc.).
However, I cannot comment too much on different models for different countries. some info here on that: https://en.wikipedia.org/wiki/Yamaha_XT_600
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Squily
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