Fender emblem mounting

[Tx Firefighter]

I'm fixing up some extra fenders for my 78 truck. My question is about the hole pattern for the fender emblems. Are they all the same for the various emblems ? I know this seems a foolish question, but I figure to turn up a pair of Silverado 30 emblems at the swap meets next summer and wonder if they will drop right in to the existing holes. Knowing this would allow me to go ahead and paint all the body panels knowing the holes were proper for any emblem.