1) Both are xianxia dramas.
2) Both involve heavy use of CGI
3) Both also have fantasy tags
4) Both are historical xianxia romance
5) Both involve gods and demons

1) Both have two males as leads
2) Both are danmei or BL.
3) Both are adaptations of same sex novels
5) Both are period dramas
6) Both have censored same sex romance

1) Both are comedy
2) Both have romance
3) Both involve a trace of time-travel
4) Both are historical romances
5) Both dramas, have marriages where a man is 'lesser' than his wife. And so, has to obey his wife, who is considered 'higher' than him.

1) Both have a male as main lead
2) Both are adapted from novels
3) Both are historical dramas
4) Both have a sense of romance
5) Both contains heavy use of CGI
6) Both somehow involve saving the world.

1) Both are censored same-sex dramas
2) Both are of the xianxia genre
3) Both have two males as leads
4) Both have a bit of mystery and wuxia
5) Both are adapted from boys' love novels.

Both are censored same-sex adaptations.

Both fall in the mystery genre.

Both are historical dramas.

And both are wuxia.

The same genres: fantasy and historical.

Also, the main target / audience for both dramas is youth / new adult.

Also, similar use in CGI. The CGI in both dramas is in nearly every scene.

And they both have a setting / world that never existed in history, but was created for the purpose of the drama.