I have both, they should fit (although I have never tried it). Differences are; japanese rims on TTR, San Remo Italian on TTRE. Cush drive and 47 t sprocket on TTRE, 44t and no cush drive on TTR.
Otherwise, swingarm, spindle, chainguard etc appear to be identical so only issue I suppose would be final gearing. Internal gearing is apparently slightly different hence different sprockets.
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