The announcer addressed this, he said that he footage was not the same but looked similar because of the proximity of the boosters to each other. I think they were just extremely well choreographed. If you watched the side view from the landing pad they landed at almost exactly the same time.

In the on-board footage both landed on the same pad. https://youtu.be/wbSwFU6tY1c?t=37m53s

Ah you're right. If you go back a few seconds you can see its using different camera angles. I'm guessing they just accidentally switched both to the same booster for the landing shot.

Its an easy mistake to make. Given they seem to use Livestream i am going to go out on a limb that they also use Livestream Studio....great software but when you are setting up PiP and copy and paste it is incredibly easy to forget to change the input source on the second frame.

Are you sure? It's at least cropped differently - in the right screen you can see more of the "metal foot".

They weren't, if you look at the winglet thingy you could see the cameras were at slightly different positions.

https://i.imgur.com/xP9JxOB.png

It is just cropped.

https://www.youtube.com/watch?v=wbSwFU6tY1c&feature=youtu.be...

You could see one of the boosters firing from the other booster. They were not the same.