The diesels had a 2 litre rather than a 2 1/4, but most will have been updated by now. the very early petrols had the Series One engine, they are rare.
The other differences are fairly minor, shape of the front apron, way headlights are fitted, the way the fresh air flaps work, the fuel pipes and so on. In true Land Rover styler most of these didn't change at exactly the same point they became 2As.
I wouldn't expect any of these to have a significant effect on the value unless it's a perfect concourse spec vehicle.