School me on front fenders

[69GMC2004]

I recently picked up a 1969 GMC 3/4 ton for a project. The whole front clip is in pretty rough shape (fenders and inner fenders rusted, grill smashed up). Since I will need to replace fenders and grill I'm looking to at swapping out the front clip for a single headlight set up (I like the look better and it will cost me a few hundred dollars less). I'm wondering what the differences are between the 69 GMC fenders and the Chevy fenders as it pertains to the grill fitment. Will I need to get the Chevy fenders or the GMC fenders? Also, are there any differences in the radiator core support where it bolts to the frame? Thanks.