The engine is the same, but code works very differently, specially because Cell was a very unique CPU.TLOU characters cast indirect shadows instead having screen space AO implementation (which are always just approximations). Also the contact shadow should be minimal/not visible in cases like that picture where there's a lot of light, most AO implementations ignore this and will give you thick contact shadows even when there's bright light.
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No, because
1) GOW HD was not done by Santa Monica
2) The engine ND will use this gen is the same engine that was used in TLOU/Uncharted 1,2,3. Unlike GOW3's engine which was largely rewritten considering the massive changes in rendering techniques that came about with the 7th gen.