I'd venture to say that it is an open question. One of those trees needs climate zone 10 or warmer, the other one needs climate zone 8 or cooler. If you have the moringa in a pot (so that you can take it in for the winter), then it is not going to have a problem with the juglone from the black walnut.
They both need very warm climates.
MORINGA STENOPETALA is a little more cold tolerant but not much. A ground freeze will kill the roots.
Recommend growing a few in a greenhouse for seeds and growing several outside as annual for leaves only.
The black walnut will grow in zone 10+ if you plant it there but it will not really fruit. Because they are from different ecozone They will most likely not affect each other.
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