No. Steering is quite different between a Series and a 90/110.
Were it me I'd have the steering box out and strip it on the bench. they're not all that hard to overhaul - just did one for my Series I 86. You could always sort one from a scrappie and reseal/rebuild that, then swap it in if you don;t want the vehicle down for any length of time.
Replacing a steeringbox is fiddly and annoying, no more. On a series III the dash will have to come out, all the wiper/turn signal gubbins off the column along with the wheel . All the braces inside need to come out, and the inner wing box cover and perhaps the inner wing shield itself to allow the column to come out of the box bracket on the chassis/bulkhead.
What may be in your steering box is one-shot grease for CV joints/swivel balls. That's not an uncommon "fix" for leaking steering boxes.
Alan