Yes. Fenders, hood, grille, bumper and lights are what you need. Gotta do it all, can't mix and match.
03+ GMC front bumper will work instead of the Esky/Denali one if you prefer.
All and that means ALL all. Bumper brackets, reinforcement bar, foam pad, grille center support bracket, etc. etc.
If you get a boneyard clip off an actual Escalade or Denali of course it will have the fender cladding, which your doors, cab, bed will not have. If you remove it you'll have holes to fill.
If you get the aftermarket clip they generally do not have holes or cladding, but another gotcha I've noticed is (at least on the one I got) there weren't tabs in the fenders for the corner pieces of the cowl plastics to attach. Had to add 'em in.
It's a simple 1 day job to swap the clips though. A 1999-2000 Escalade/Denali is nothing more than a dressed-up gmt400 Tahoe.
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Richard