Nanos all use FTDI chip for USB interface, yes?
vendorID/productID is built into the FTDI chip, nothing to do with the '328 that makes the board an Arduino.See page 15.
Can't see seperate chip? Did you look on the bottom.
Page 15 of the .pdf file I attached.I have no reason to believe FTD VID/PID is any different between chips.
Nano supports 8 Analog inputs, Duemilanove only does 6?