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OK...this is actually a great point! Using this method you will get some very minor (if any) blending with the original color. What you are seeing is that the multiply setting allows the shading tones and highlights to show through making the wall with it's color change appear more realistic.  But it will darken or lighten the exact chosen color for the wall. 

You can test this by using the Info Panel and any tool to go over the wall. You will see the RGB values change as you move across the wall. The closest you will come to the original color will be around or in a highlighted area.

Test this on the original photos wall and you will see that it's not the same color everywhere. If you want the natural lighting of the wall to remain, you will never have an exact color match!!!!

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The only way to ensure an exact match would be to leave the blending option set to normal.

This is what you will have. Does not look natural.

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You will then have to add the shading and highlights which will again cause the exact color to lighten or darken no matter what technique you use to replace it!