Headstay size

[Brion Toss]

Hello,
Both wires use the same pin size, so no harm done there. The 9/32" is a teensy bit heavier, somewhat more expensive, probably not an issue. Windage won't be a factor inside the furler. So you might consider going up, just to reduce elasticity, and thus luff sag.
Fair leads,
Brion Toss