They are clearly different. Look at the 2 pics. One has "gauges" in slot "D" with a P/N 8392-J. Also the back-up light circuit is paired with the gauge circuit. The one in pic early post #3 In slot "D" it has "inst and lamps" with a P/N CHEV-4282-J. Could someone with original 67' gauges just please go and take a picture for me. Want to know the P/N under the flasher relay.
The reason the two fuse boxes are different is one is a 66 and one is a 67. I know the 67 photo is a non-gauge car as it's my photo. Neither the parts book nor the AIM list the fuse panel as a separate item but rather it is part of the wiring harness. For 1967, both do show different harnesses for (1) Chevelle except floor console, (2) Malibu, S.S., w/floor console (exe. inst. panel gauges, Sta. Wag., Sedan), and (3) Chevelle w/inst. panel gauges.
If there's a physical difference in the fuse placements and ratings on the panel itself, neither book shows a real image of the panel itself to see if any fuse placement or ratings are different between the threee. I can't imagine there would be a physical difference in the panel itself. If someone has a 1967 Chevelle w/factory gauges and can take a clear photo of the fuse panel, I'd like to see it as well.