The basic 2.4 litre block is the same as that of the non turbo Hilux, the cylinder head is not.
The 2.4 Turbo engine has bigger valves and a different cam grind as well as a different port shape.
(You can still get new cams and heads for the turbo engines, if you know where to look)
To use a Hilux 2.4 litre (tubo or non turbo) engine, the oil cooler must be removed from the Hilux engine and the Hiace part installed as they are different, they are interchangeable though), the sumps are also different but interchangeable.
The 2.4LT engine in a Hilux Surf mounts the turbo high in the engine bay, the Hiace turbo is down low on the drivers side of the van but the turbo's are identical, it is the exhaust manifolds that are different and yep, they do interchange.
Any more info needed?
Give me a yell, I may even be able to put you in contact with an engine builder or supplier in your area that may be able to help you out.