I am not located in the US, but I did a googlesearch on the partnumbers, and from the pics on the amazonlinks the older number is before the "facelift".
Main differences are:
The newer model has a sturdier hosegarage with T-loc compatibility
The newer model comes with the newer, more flexible hose with standard sleeving, so it's not ribbed on the outside.
The newer model has a redesigned hosewrap at the back, one side can swivel for faster hose-removal.