The Wikipedia statement has two sources. As I said Winslow Wheeler struck me as someone who really knows what he is talking about. This event is also discussed in other places on the Internet such as in this paper from the Army War College. All this is enough for me to believe that it is quite possible that a second F-117 was damaged.
Plus, tell us the serial number of the other F117 damaged in Serbia and never be to flown again?
Obviously the Pentagon is not going to release that information.
Actually since the F-117A has been withdrawn from service that type of information will eventually come out. Other aircraft types document their 'mishaps' and 'losses' by serial number. I wouldn't be surprised if when perusing the F-117 serial number file you might not find a unit that got scrapped "for spares" (or some other euphamism for a heavily battle-damaged craft).