For a 1992 vehicle it doesn’t matter if its a landcruser prado or prado. You should look for the condition of the suv. The engine, gear, suspension and body.
I had a 1996 prado, 1kz turbo with manual transmission, it returned me almost 10+ kms per litter.
I’m not a fan of the 5l and 3l engines, they feel so underpowered and have a lot of noise compared to a 1kz.
If you want an old diesel SUV, 1kz is your best option.