The engine in the MRS and the Corolla are the same engine, they only adjust the cam timeing, not the valve lift and duration.
They are both VVTi engines.
So far the Celica, TS Corolla and Japanese spec previous generation MR2 and Altezza RS200 are the only cars to get VVTi-L engines, with varaible lift and duration.
In an enigne with variable cam timing you should not notice any change over point as the cam timing is continuosly adjusted as the engine changes rpm.
Note: some older engines with variable cam timeing simply used to stages, and so minor change in exhaust and intake pitch could often be heard at changed over. e.g the 20valve version of the Toyota 4age.