Also, a quick Google shows that what people (and
@yessir321, presumably) are talking about is the INTRO to both songs - claiming "they're exactly the same". One guy on a "Eighties" tutorial vid actually commented "Thanks, now I know how to play "Come As You Are".
None of these people are musicians. And no, the aforementioned commenter does NOT know "how to play Come As You Are".
Here's the first 2 measures of both songs:
Come As You Are:
D D Eb / E G E G E E Eb
Eighties:
E E G E G E D / E Bb E E Bb E G E
What's confusing the unlearned is the tempo, which is similar. But that's like saying "All blues songs are the same because of the shuffle". It's an inherently uneducated POV.