Interchangeable parts

[Black/Silver]

Hi have a question 

Ive never had both trucks and recent got a 2017 silverado 4x4 crew cab ltz . My question is has anybody or does anybody know if some parts could fit the truck? Am not trying to convert it at all but if there the same maybe the mods i want to add to the truck will fit . I wanted to know if the fenders are the same size or even been swapped out from 2500 to 1500 years 2017 second question do the wind shields fit the same or same size ?  3rd question And what about the gap space from headlight to headlight from the inner side where the grillie is at the same ? 4th question bed sizes the fender area 2017 silverado 2500 crew cab rear bed fenders the same as 1500 ? If anybody could help with this it would help to see if i could make my project happen