Yes, you may well be right. I've seen both of those methods used in individual 2-way switching circuits (i.e. either L or N travelling with the strappers) - but, as you imply, to use different methods for two 'related' lights/switches would seem to suggest that it was done for a reason.
That's clearly true.
I don't see 2 different methods. As I see it there is a 2W circuit switching the live, operating a lamp(s) and another similarly described circuit. The fact that one has the load near the supply and the other has the load at the distant end dictates where the live and neutral run. If they had been swapped into the opposite cable then the cable would not be balanced but as soon as any additional load is placed on the left end they will not be balanced anyway.
Yes, they are exactly the same, switching-wise, the only difference being whether the L or N accompanies the strappers in a 3C cable.
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