Kat....
Sorry, I don't have access to a camera... . But, this is exactly the same cover as the red one... . same lettering, style, etc..... BUT, this isn't installed and I haven't seen a red one in person, so this is my best assumption that Cummins isn't manufacturing a bunch of different valve covers... except, you've probably seen the one used in Banks ads which shows the oil filler cap at the back of the cover. I believe these are the motor home applications. Again, that cover looks identical except for oil filler location.
I know what you mean about some of the Cummin's parts folks.
I called back just now to be certain there was no confusion on the part numbers, and

I got another story. ( The guy who took my original order was not at work)
The PN on my invoice is 3942136, and like I said, I paid $65. 80.
When the guy punched in the number, he said it shows that this PN has been superceded, and the current PN is 3945799, and the cost is ~$68. 00. Further, the description for 3945799 only says it is "Base Engine Color"..... which we know is black. He could not explain how I ended up with the "old" PN... . it was even on the packing box.
I did verify again, that the red cover is 3943668 and cost is $112. 00.
Apologies if this appears to be too much into, but I don't want to be the source for some other TDR member's headache in trying to buy one of these... .