Grill swap/interchange - 74 on a 79?

[Puglia10]

EDIT: sorry I found out after this is in the FAQ section. You can pretty much ignore this thread. Thanks

Do the grills all line up and bolt up the same? Or are extra parts needed?
Reason I'm asking is my 1979 GMC dually grille is cracked and broken, so I am going to replace it. I like the look of the deeper 73/74 grilles, especially with the 454 emblem, so do they interchange?

While on the topic of grills, does anyone know why NO ONE sells a factory replacement grill with the GMC logo? It's either blank or a bowtie. I'd like to look kind of factory.