Search the downloads. They're probably there someplace.
Or have a look on this website:
[
gp4.gamers.nl]
Yes, you can use GP3-2000 trackmaps in GP3, and vice-versa. They both have exactly the same dimensions.
You can also resize and crop GP2 trackmaps for use in GP3 and GP3-2000, except that GP2 track maps only have a single view of a track as opposed to 4 views for GP3 trackmaps.