Hello. If you’re talking about Grandia 2KD 2.5, 1KD 3.0 engine or even the 1GD 2.8, it will definitely win over this Urvan Escapade which is a non-turbo 2.7 diesel engine. I dunno about the Toyota 3L (early engines of toyota hiace and same as the year model of this urvan maybe).
Both Toyota and Nissan have available parts in the market whether Original Surplus or Replacement. Well, as regards the pricing, I really don't know how much. I suggest you join any Facebook Groups for Toyota or Nissan for that. But most parts are also available in every "suking" Auto Supply.