Yes ...
They used the same neck for 6, 7 and 8 stringers.
Some folks call the 8 stringers ... "No-Slanters" ... cause the string spacing is so tight.
Check out the "string thru" holes on Prewar Bakelites ...
There are 13 "indents" ... starters for drilling the holes ... for 6, 7, or 8 ...