Those numbers are NOT for the same part - they are wrong.
8970317592 is the latest part number for the Turbo pressure plate (it supersedes PN 8941322320). From my investigations a few months ago 5312200240 is still the current part number for the non-turbo pressure plate.
If you have a standard set up and are not running an Isuzu box then the clutch plate itself is a Land Rover part and not an Isuzu part.
With the 4 speed box (LT95 with a 10 spline input shaft) there is a turbo and non-turbo clutch plate available from LR as they supplied both types of engine in front of the 4 speed box, e.g. the non turbo 110 and the turbo'd 6X6 Perentie variant. I have seen the different PN's for the 2 clutch plates as I spent a while trawling through the microfiche's at the local LR dealer.
As far as I know Land Rover never supplied a 4BD1T (i.e. in the 6X6 Perentie) with the LT85 five speed box (23 spline) and as a consequence only one clutch plate is available from LR, which is for the non-turbo application. It is part number AYG3463.
See my thread from a few months ago for more info:
http://www.aulro.com/afvb/isuzu-land...tml#post969437
Hope this helps,
Jon
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