The previous image was of M87.[1] The new one is of Sagittarius A*, which is the black hole at the center of our own galaxy.

[1] https://www.nasa.gov/mission_pages/chandra/news/black-hole-i...

I also remember this were photos of the milky ways black hole several years ago, am mixing two memories or did news articles then also talk about Sagittarius A*?

That was a different black hole that is further away. This black hole is much closer in the center of our galaxy. So now we have pictures of 2 black holes to compare!