'Get the index of the unique item only

I have a list of colors as shown in the expanded code screenshot below. The list will always have 4 color values, but only one of them will be different than other 3.

But this one different value can sit at any place in the list.

What I need is, get only the index of that item which is different than other 3.

I have tried playing with distinct but it doesn't help since I only need the index not the value.

enter image description here

c++sharplist


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