Here I tell you why angel fazhuman appears in TDNaAAT, if both games take place in different years, well here I explain

FNAA Occurs in 1996

after the FNAA CH 1 and 2, several years later, angel's Entertainment World, decided to open the restaurant but better, as many years passed and was still remembered the place, in 2020 in a factory of angel's Entertainment World builds the animatronics faithful to their old designs, Angel, Freddy and Walten was ready, just missing Jake and a possible new animatronics (here occurs Angel's Oxygen Room), in 2022 would open the new angel's Entertainment World.

But in 2023 comes the November Earthquake, and the restaurant was destroyed.

This is the history of FNAA in the TDNaAAT Universe.

Here I will clarify a few things:

No, both games do not take place in the same universe, only Angel's Entertainment world exists in the TDNaAAT Universe.

So in the FNAA games (their universe), Aran's and Toto's do not exist.

I have Permission from @MrAngelGames584 for this

As FNAA is now Canon on TDNaAAT, I recommend you to play the FNAA Saga, if you want to know more about the history of Angel Fazhuman.https://gamejolt.com/playlist/the-five-nights-at-angel-s-saga/357400