Differences are orbital size, hammer stems vs strait stems, and serial numbers.
The serials you gave are for the XX, so you have XX earstems at the very least. If you suspect there has be en customization, the orbitals may be different. XX has larger orbitals than the Juliet. The intake/screw ports have a slightly different shape as well. But chances are you have a XX. Not sure about the carbon aspect. Could be a custom finish, but people often mistake the X-metal colour for the carbon one as well.
Like Greg says, best option is to post a pic, especially of the orbital.