First of all,you shoul know that Chinese is very fexible and many Chinese words have the same meaning. "按照" usually means “follow”“as sb./sth.said”“obey”，for example, 按照我说的做，Do it as I said(do it following what I said), "根据"is a direct translation of “according to”，for example，根据那个调查，他是无辜的，He is innocent accroding to that investigation. if not so serious,we can use these two Chinese terms alternatively. I can practice Chinese with you,contact me by wechat(BlueSnow0222).

按照 = according to, following, as follows, there is no proof whether there is solid evidence or not. Can be a belief. 根据 = there is irrefutable proof that it is true/false etc.

Agree with Simon

意思相近，多数情况下可以互换 用于陈述事实 Meaning close, most cases are interchangeable Used to state the facts

都是对的。 很多in English many or a lot of which is the real answer