So, english is not my native language, but I'll try to be as precise and clear, as I can describe the things not cortrect with the image. :)

1.: Just above the area you overlayed the transition is noticable, because the color of the inserted part is not as blue as the rest. The inserted Image is a shot more grey than blue. After noticing that the rest is also noticable not as blueish.

2.: The radiation of the lightbeam also indicates left and right, where the inserted part ends. first of all the center part of the beam seems a bit smaller, also the radiation is a bit mor violet, while the beam in the outer parts is just a tune more pink.

The beam seems to be a bit more sharper in the inserted part.

EDIT:

I played a bit with GIMPs Color/Satuation setters, to make the areas not matching visible.

Maybe that helps. (I do not know, because I have no experience how color blindness works.)