Yes, R32's have a cable all the way to the dash where it is then converted to a signal the ECU can read.
R33's have an electronic sender on the gearbox.
R32 have a final drive ratio of ~4.3:1 while R33's have a final drive ratio of ~4.1:1, the senders on the gearbox have different toothed cogs to account for this.
Have a search of the forums, there is a LOT of info on putting 25 boxes in 32's and overcoming the speedo problem.
Basically, you start with a Navara sender (comes with a 17T cog) and then swap in a cog that fits/suits.
As I changed my final drive ratio to 3.9:1, I found that the 17T cog on the Navara sender was pretty damn close and would be fine.. it reads 7kmh high which is fine in my books