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Front lower control arms na & nb, are they the same and therefore interchangeable?
I know there is a change in the suspension geometry between na & nb but I don't know if this is just the pick up points in the subframe or the arms as well.
Anyone know?

Yes they do interchange, found the info on miata net.

Different Anti roll bar mounts (U shape on NA, L shape on NB)
Different Ball joints (length of the thread is different)
I think the NB's have threaded spots for the ABS lines? (or is that on the shock?)
But other than that, they are the same and easily interchangeable.
If you need spares, talk to David, he has heaps.

the ABS line is on the shock.