Zoom

So I’m fairly new to the larger DC fandom and am only really familiar with the CW shows, films, and the old DCAU. There are times Thawne is referred to in comics and other media (Flashpoint) as Professor Zoom, but in newer media like Injustce and the Flash show, he’s Reverse Flash and Zoom is a different character. Was this just a name change to distinguish two different characters like Shazam and Captain Marvel? Or is there another explanation?

In the latest issue, Barry and Iris discuss Zolomon's past. One of the very next panels, Zoom talks about not being from this timeline.

Why does this timeline have events that happened in New Earth?