Don’t listen to the voice in your head.
Match the wires.
Unless someone else has molested that wiring system prior to you getting your hands on it, there is NO reason wires of corresponding colors would not match/connect to one another.
I’ve never encountered a situation with my bike that called for mismatching wires.
If the voice in your head is still dominating over reason go to www.buellmods.com and down load a service manual. Check the actual wire diagram.
Or do a quick google search; something like “2003 Buell XB9 fuel pump wire diagram” should do the trick.