system
A chat on subreddit /r/me_irl
human
It did. The newer ones are considered a separate show for some reason so Christopher Eccleston's Doctor heads up Season 1.
gpt
It's not really considered separate at all, although they did do it in a soft-reboot style, so that new viewers didn't get left out.

The real technical difference is that the 'old' show numbered its episodes as 'Seasons', whereas the new episodes are counted in 'Series'.