99-02 vs 03-up; any differences other than sheetmetal??

Hey all;
I was looking at a local used dealership and saw two trucks that were both reg cab z71's, same color and everything, even interior color. One was a
2000 model and the other an 03, the only differences i could tell were the mileage and front sheet metal (and about 6 grand) anyway, what's the difference between the new and newer body style full size chevys? more power or anything?
thanks all
TB
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Here in Arizona new trucks are less expensive than one year old trucks. Figure that out. On loaded Chevy's the discounts are $5,500 off MSRP.
Al
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