I don't know for sure, but as the Isuzu is effectively a conversion of the V8 I would be very surprised if they are different. Note that there are several versions of the prop shaft that while different, appear, as far as I can tell, to be interchangeable.
Take them off and compare - if the attachment flanges are the same, and the closed and extended lengths are the same, then they are interchangeable, even if not identical. (The one I am using at the moment has different U-joints and the spline the opposite way to the one it replaced!)
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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