I can't imagine the differences are enough to cause anyone to get lost or cause any other major issues. Most updates are minor, and reroutes should be well marked or quite obvious.
The two that come to mind--McFarland Canyon to Thicket Spring/Mt Peeley, and just east of Pine TH, are quite obvious and signed. If you are concerned about the routes, they have been updated on the ATA website and you could download them for your GPS.
The bear went over the mountain to see what he could see.