The differences aren't visible in your picture. If you are trying to use a black drum in place of a color drum, then the black end piece needs to be swapped between the new black drum and the old color drum. Depending on when that black drum was made, you may also need to swap the small black piece that is still on the metal drum shaft in your picture. One last thing that needs to come off is a small plastic piece attached to the right side of the drum assembly, 3/4 of the way down the body of the drum towards the rear side.
The differences between the color and black drums (besides the chip itself) are:
1) The piece of plastic that is held in place by the 2 screws on the black drum end cap in your picture. That piece is a spacer the affects the gap between the drum and dev unit. The black drums have a raised tab on that piece, where the color drums are flat.
2) The plastic piece attached to the right side of the drum assembly.
Konica-Minolta DR-313 Drum Comparison.jpg
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