i think there's only a year between the two, iirc the movie was out before the first issue was printed. aside from the fact that both protagonists wake up in a hospital there's very little similarities between the two. TWD plays up more of the aspect of humans capable of being every bit as cold and vicious as the zombies, it's hard to find someone to root for.
28 Days Later had a lot of that element too I thought. That's why I loved it.