Bruce is correct as the NAXO and SNAXO could be different. Naim changed the way the SNAXO was configured when they revised it from the 2-4 and 3-6 to the 242 and 362, so instead of the old way where in a 2 way active system you would have one stereo amp doing HF and LF of one speaker, it changed to one stereo amp for HF of both left and right speaker and the other doing LF of both left and right speaker.
Note that the connections I posted above apply to the original wiring configuration and not for a late SNAXO 242 (or an earlier unit that has been modified - see below).
To make things even more complicated, it was not unusual for the older NAXO and SNAXO to be rewired by some users to this different configuration, so buying older NAXOs and SNAXOs can be something of an unknown unless the history of the unit is properly documented.
I would suggest removing the sleeves of the NAXO and SNAXO and taking some pictures, particularly of the socket wiring areas, and then contacting Naim support and service to ask them whether they can tell how each has been wired up (i.e. standard or not).