I'd be curious to know the definitive scale of the 4E map as well, although I tend to think the sourcebook version has the correct scale. That would be more consistent with the scale of the preceding D20 map.

By the way, there's at least one immediately noticeable discrepancy between the 4E map and the D20 version. Williamsfort has been moved to an incorrect location on the 4E map. It should be at the northwest edge of the Stormkiller Mountains and not out on a plain and northwest of what I assume is a remnant of the older, larger Redwood.