If your referring to the AMG spark plug decal. Those were black framed all the way up to 95 for the F8DC0 spark plugs (also for the H5DC spark plugs). For the E60 F7DCO plugs, the decal was always silver (even on the 92-93 6.0l cars, I have seen silver, but if you have seen black framed F7DCO decals, post a picture as I don't have any pictures of these). Also, just like the other AMG decals, the E36 also had an all silver F8DCO decal at the same time as the black framed F8DCO decal
I don't know what to make of the decal variance, maybe its a 94 vs. 95 change that just involved the W124, it sure didn't apply to the W202 1995 C36 though, as it had the black framed decals. Its another abnormality.
Regardless though, the decals on the E60, appear to be correct for the car (at least the spark plug decal, can't read the other)