Is a clio williams gearbox any stronger than a 1.8 16v clio gearbox?

At the moment I am running a jb3 1.8 16v gearbox with my GT turbo lump in my clio but want to make the most of the engine but not sure what the gear ratio and final drive of the jc5 and jb3 are and to be honest its all above my head!!

Can someone point me in the right direction please