Is anyone an expert on the side draft SU and Stromberg, jet and
needles?

Are jets essentially the same; only the needles (as marked) different?
Do these carburetors, fitted with various needle applications,
essentially each have common jets?

If, as long as needles match, is the only difference in jets going to
be any wearing, out? (Say, one carbo with a brand new jet, the other,
with used jet of unknown age, but both rebuilt with new needles?

Or, it now looks like I might have got two, NOS (SU) rebuild kits, but
of difference in production (i.e. fittings screw together, but each
kit is of different manufacture) so, aside from my dual carbs looking
odd, with different jets, mounted, is my only worry getting needles to
match? I know, how I might actually notice, wearing, in the needles;
but do the jets even wear, out (much, besides, just their leaking?)

Thanks