Color on one layer is always lighter
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!

