Craig, you are partly confusing the way a jet works with the way a fan/prop works. The turning of the turbine does not create the thrust, it is a windmill, the turbine creates a heck of a lot of drag! The exhaust velocity of a jet comes from the expansion of the air caused by heating, the exhaust velocity of a prop or fan comes from mechanically pulling and pushing the air backwards. The rpm of the jet turbine is designed to make the turbine blade speed reach an optimum so on a large diameter turbine you have to turn it at a much lower rpm than on a small diameter turbine.
If you take two fans or props of same pitch but different diameter and turn them at the same speed, you get the same exhaust velocity, the difference in thrust is the difference in mass flow due to different diameter. In two jet engines of different diameter you get different thrust due to mass flows, same or similar exhaust speeds, so those parameters can be the same as the fan/prop, but the turbines will turn at very different speeds unlike the d/f or props which may turn at same rpm,becase the turbine is not generating the movement of the air but instead is windmilling in it and its pitch will be designed to get the optimum tip speed.