Front clip/grill questions

[Rdub]

Bought a 69 short stepside a couple weeks ago, mostly for the drive train..... newly rebuilt 396, th350, u-joints and upgraded to front discs. Some of you may have seen this on "collectorcartraderonline" (Everett WA) a few weeks ago. This was a partially completed project truck and the po had plans to replace the cab & front clip as they are pretty much toast, due to major rust. Story was.... he recently married and the the new wife said she was now parking her car in the garage..... go figure ;-) ..... anyway, I have a parts truck, a solid 72 cab with a good front clip...... my questions, I really like and prefer the 69 grill, will it fit on the 72 fenders? If I swap in the 72 cab do I register this as a 72 or 69? I have titles for both. Thanks in advance for your help!