And if you are colorblind, two pictures will look similar to you, but not the same. This is due to the fact that in order to simulate colorblindness for the normal vision people, certain colors from the normal photo has to be digitally altered to the effect.
In other words, for normal vision people, "normal" photo is the full color photo. Each "colorblind" photo is associated with color deficiency as associated with the colorblind people. To stimulate the deficiency effect for normal vision people, the corresponding color has to be altered from the "normal" photo.
For colorblind people, you will get a much vibrant "normal" photo when compared to the one that is associated with your color deficiency. This is because the color deficiency photo loses some of the color that you cannot associate with, rendering it less vibrant.
To test if you have colorblind, you can use this simple test available on the same website. It is very effective, and you can know the results right away. If you suspect yourself as colorblind, you might want to get medically proven by going to the doctor.