From the twitter footage:

This is from the first couple frames showing that Autopilot is enabled, just as the blue lines appeared on screen: 42mph displayed on the center console.

And another a couple seconds later:

And from the youtube footage:

Again, from the first couple frames as Autopilot is enabled, just as the blue lines appear: 39mph displayed on the center console.

Here’s more from youtube, taken several seconds apart:

They are very very similar, but they do appear to be two different takes.