I'm sure there has been posts about this before, but I have two 4003's in my possession, and had them both out tonight. I snapped a few pics to show the differences in body styles.
The one with the stickers on the pickguard is a brand new 2013. The other one is from 1990.
You can see the newer model has skinnier upper horns. Also, the top horn on the 2013 is a little shorter than the 1990.
The headstocks are a bit different as well.
The neck on the 1990 is thinner than the new one. The new one is a bit chunky and in a way feels flat on the backside, almost like a 2x4 with rounded off edges. That may be a bit extreme, but it's the best way I can describe it.
Enjoy the pics!