They are both awesome players throwing the football, but they nevertheless do feel different in Madden. Aaron Rodgers in particular is
significantly better at evading pressure and operating outside the confines of the pocket thanks to his better ratings in SPD, AGI, ACC, ELU, and TOR.
At the very least, the difference in speed between the two players should be
incredibly obvious.
OVR has never had any bearing on a player's on-field performance. If a player is an OVR 65, it's because he likely is very bad at most skills relevant to his position.