I would assume it's just like my truck key I recently had to make. The locksmith put the key in a computer, took it out, cut the new key to the same as the original, then put the copy in the computer. He was able to change the RF or whatever to match the original. I usually don't check spares but I certainly checked that one. It worked just fine. However I don't have a Chevy "red key" and I don't program the new key from the ECU.
The point of the red key is that it IS the computer that the locksmith used to duplicate my truck key. When you use the red key procedure, the red key authorizes the ECU to program the incoming key. When you place the new key into the ignition, the ECU will upload the information to the blank.
If it were me, I'd take a ride down to the locksmith with the owner and have him pay to make a copy. Run back to the bike (or just ride it over) and check the key. If it works, then you have 2 copies and you'll be at ease. Call ahead to the local locksmith and ask if they have Ducati key blanks with the RF chip. If not, then you can order them from Ebay and there are now a few other places that sell the blanks for a reasonable amount. Keep in mind that with all this new technology that is supposed to make our lives so much more wonderful, that your new key may cost anywhere between $40-$100. I'd like to know what happened to the days of $1.09 key copies.
09 Aprilia RS125 plated
06 Paul Smart Sport Classic NFS ever.
08 S4RS Tricolore #081 NFS ever.
01 M600, aka, The Pink Monster
97 900SS CR
72 Norton Commando 750
03 KX60 with S4R rear shock,Honda CB350F, Hodaka Ace90, 3x Yam-YGS1, Yam-CS3 200, Vespa small frame, Gilera 106, Puch Sabre, Puch 50 Boy Racer, Benelli 250, Benelli 360, Honda CB350T, and many more.