No - I am an expert!!!
The difference between 2002 and 2004 is the 04's have a better footbed, and the inner material on the heel & toes is much more comfortable.
Also the sizing on the 04's may fit a bit smaller so factor that in when you buy. I think in the 02's a large was a bit big for me and in 04 a large was just right. (I have a small size 10 foot)