If Kata are different, than everything is different...including principles of technique. If you are not experienced enough you will lose track of your motives, and you will forget which is which. So...Principles of Tensho in Goju Ryu will only confuse a inexperienced practitioner of Shotokan. Goju Ryu and Shotokan have no similar Katas. If you were a Uechi Ryu Student, moving to Goju Ryu...I would have no contests of one transferring...but Shotokan and Goju ryu are not that similar.