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Is it possibile to separate the light ray generated by the lamp in compositing from the object it sheds on, i.e. The end point is I have a layer with a translucent ray of light arranged in the shape of what it sheds light on. I need this because I have an object that I color in a pohotoshop but it is always illuminated by the same light.

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You might look into render passes, Shader AOV and the Cryptomatte node. If you render out the different Render Passes you can edit them individually then composite them back together as a final render. You should be able to recolor the base color/diffuse render pass for the object you edit pretty easily this way. Check the first link which has a good overview.

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