Hello,
Probably, most of this difference is because you selected wrong colors:
- The pink is not (0.835, 0.00955, 0.538) but something like (0.922, 0, 1).
- The green is not (0, 0.561, 0.08648) but (0, 1, 0.00913).
My values are not perfect too but much closer to the PS, because I used the color picker:
Also keep in mind that the preview scene is not a Texture/Image, it is a scene, it has a light etc and this changes the final preview result. Press L and Left Mouse Button to see how light direction is affecting the result.