rebuilding a pre-36 steering box - parts interchangeability

[Mark from Australia]

It would seem as though right hand drive 33-34 steering sector shafts in a 15:1 ratio are out of stock in the major supplier's online catalogs

fortunately at least worm gears are still available.

A quick question - a friend was telling me a '36 17:1 worm gear and sector will interchange with the 33-34.

The worm gear has the same number, just a different pre-fix.

Is my friend correct? Can I use an aftermarket '36 worm and sector in a 32-34 steering box?

Thanks for in advance any information you guys can supply me with - this place is amazing with all Ford-sters amassing a depth of knowledge that exists out there.

Cheers.

Mark