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Dishpet said..And some more...

What I see:
Fuses got rid of the front lip so the leading edge looks lower profile/sharper. Going by the marks on the wings it also gets narrower at the front
4 screw system still, yet...
Front wings have a chamfered notch at the back. Looks like the new fuses have a matching feature to keep the older wings off the new fuses, likely because the fuses have less material than the old design. But, that feature doesn't seem like it would keep new wings from being used on old fuses...
Edit:
Front two screws don't have an even spacing, so the 4 holes won't line up with older fuses