Naaah, they've both always been 50, it's the same engine.
What WWP does do differently is it relies on a different timer for polling input (or something like that), resulting in that slightly different feel. But WA at the time used the same, it was in later beta updates that the devs made the switch to this more precise one that we enjoy today. Though you can still switch back to the old behaviour with the timer workaround tweak in the advanced options and the replays obviously stay compatible, proving that it's all still exactly the same as far as in-game actions are concerned.