Spokes are spokes. Except your wheels probably have straight gauge and not butted spokes. Nipples are a bit different for wood rims. They are an inch long instead of the standard half inch for metal rims.

And it sounds like your spokes were tied and soldered. You wrap a bit of wire around where the spokes cross and then add some solder. It increases stiffness to the wheel. It tends to be more favored by track riders over road riders. A nice touch but not necessary.

For spoke length, just measure a spoke from the elbow to the end of the threads. The front spokes can be a different length from the rear spokes. And on the rear, the drive-side spokes can be shorter than the nondrive-side.

Personally, I don't trust old spokes. I would relace them on your wheels if they were mine. I have built about a dozen or so wheels. I tried lacing some wood rims and gave up. It's like trying to true a rubber band. Maybe later this winter I'll give it another try.