TTRE Wheel in TTR 600
 

Hi I am putting a TTRE rear wheel on my TTR so I get a cush drive.
I have just noticed the sprocket sizes are differnt 44 on the TTR 47 on the TTRE I guess I will have to get a 44 for the TTRE wheel.
I thought it would be a stright swap
Is there anything else I should know about swapping the wheels ?
Are the gear boxes differnt on the TTRE and TTR
Thanks