The way I understand it those two are somewhat interchangeable. The photomods (as in photorealistic) are supposed to create better image quality by enhancing lighting. But this also applies to a shadowmod because the game usually comes out a bit flat in the lighting area.
Everything in the game is rather close in terms of lighting intensity and a shadowmod focuses on those supposedly darker areas to create some real dark spots in the image where they should appear and therefore adding more depth and realism to the image.
That is the aspect where shadowmod and photomod are the same I guess. Only that a photomod may even go beyond that by changing overall colouring and brightness to create certain effects, not only to add shadowy areas.










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) Here's the link to his thread (where you can make your request):
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