Today I learned that their neck pockets are the same dimensions. I have both gibson and fender styled necks. Took measurements to get precise neck pockets. And got the same measurements for both. I said ????? So I got to looking at it. Found the reason the neck pockets are the same. Gibson using a binding on the neck. This binding makes the overall width of the neck the same as the Fender. However the frets on the neck are on the inside of the binding. So they are shorter than the Fenders. Making a Gibson's string spacing narrower.
This is something I didn't do when I made AutoRATic. And I wish I did. There is a 1/16 wider difference in width from the body to the end of the neck plate. This translates to 1/32 on each side. This doesn't sound like much. However if you take a straight line from this angle and compare it to a perfect 90 angle you will end up with 1/8 off at eight inches. If your putting in a set bridge this throws everything off.
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Almost all Gibson necks are glued in(set neck). They have a neck tenon that goes into a cavity that's usually large. Usually the Gibson bolt on necks are for the lower cost Melody Maker and Special models. Epiphones and Maestro are almost all bolt on necks with 24.5" to 24.75" Gibson scales.
Aftermarket neck makers that make all bolt on necks, will list their necks as Fender or Gibson or other usually talking about scale length. So look them over good to make sure your getting a bolt on neck or set neck. Make sure you're ordering the right neck and the right scale length. Be sure they send you the right one when you get it too.
One of the necks I got from GuitarFetish listed the neck as being 25" scale. but the one I got was 24.5" scale. Luckily I had a bridge mounted on a "floating arched wood blank".