Color on one layer is always lighter

[Lkiia]

Hi! Photoshop newbie here, just trying to do some simple tasks with PS. 

So I have two shapes on the canvas, and I want them to have the same green color. I only have a white background layer, two layers each with a green squared picture that I saved online. Didn't change any settings, blend mode is on Normal and opacity is on 100%. 

To match the color, I used the eyedropper tool, picked color on the left pic, and then switched to the layer of the right pic, clicked on the green area with Color Replacement Tool. The color did change, but it is lighter than the one on the left pic. Like this - 

I tried different colors, and the right one is always slightly lighter than the left one. 

Does anybody know what might be the cause? These are just two normal picture I saved online. 

Thank you! 

[jazz-y]

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@Lkiia wrote:

To match the color, I used the eyedropper tool, picked color on the left pic, and then switched to the layer of the right pic

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From your description it is not entirely clear whether the objects are in the same document or in different ones at the time of color transfer?

[Lkiia]

Yes, they are in the same document, on the same canvas. 

[jazz-y · Accepted solution]

Color replacement tool works in one of four color replacement modes - color, luminosity, saturation, hue. Apparently your shapes slightly differ in lightness. When you work with the Color replacement tool in color mode, it actually changes the color, but it keeps the object's original lightness. You need to either additionally go over it with the Color replacement tool in luminosity mode

or lock the transparency of the layer and change the color of the object using the paintbrush tool (if the shape is on a separate layer and is bounded by transparency)

[Lkiia]

I tried to replace the color with color option then luminosity option, and it worked! Thank you! 🙂