Day to Night conversion in NUKE

can u give me some tips for doing a sky replacement … i am actually
trying for a day to night conversion shot…

1) i took the footage for which i want to do the day to night conversion.

2)took the sky image(night).

3) did the roto for the sky for the 1st footage.

4) and i went to premultiplyer and gave rgba

5)then went to blending mode .. and tried a lot of things this is what
i am getting

Attachment 11367
i am attaching the file plss any help will be help full or even suggestion.

In AE a simple subtract will do here, but in nuke i am not getting it. i want car video in front and the dark blue sky to be visible in the back where i did the roto shape XD

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