Don't worry
Most parts will be interchangeable.
If you check www.kedo.de (in german), their catalogue page 89 gives an overview of the parts for the XT/TT6 gearbox parts and interchangeability. They do not list the shafts however. It might be that they are indeed different, it can also be that they just changed the part numbers but that the parts ar physically identical.
Anyway, it seems unlikely that shafts from any XT will not fit into a TT engine casing. So, that's a matter of trying.
I will also try to mail you fiches from a TT and a Tenere model so you can see yourself.
Auke
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