in act it was done , just search it.And jin lost .
Ryu is far more experienced than jin , jin was still a kid and ryu was already a world champion .Ryu has mor experience than jin.I saw jins powers very well , if both of them are in their devil/evil powers their firepower should be the same since both of them blew mountains with ease(poor earth 😇 ) , in terms of speed i think ryu would handle this one , in tekken jin was shot by heihachi if i am not mistaken , although jin wasnt focused because of his fight against the ogre he saw heihachi before he shot is.When ryu was distracted he was still able to hit a guy 3 times before he could even think to pull the trigger.
Strengh:If we are talking normal ryu and normal jin , both in human powers i give this one to ryu , you can easily say that ryus body structure is far more complete than jins at least in tekken 4.In technichies terms ryu would win again , ryus ansatsuken is far more powerfull than any normal martial arts , jins karate is strong, damn strong , his punchs pierce steel , but ryus ansatsuken could pierce the sould,body and mind .
in my opnion ryu wins , but i can say that it wouldnt be so easy , bot of them are similar in many aspects .