@jeff8643
I'm aware that this is a Chinese map thread, however the Board language is English only [except in the International Zone]. Non-English posts are usually [Only registered and activated users can see links. ]. It's not hard to use an on-line translator if you do have problems posting directly in EN.

If your question is "Why are the three map image files the same size?", it's because they are [basically] the same map.