Yes I did and it does look very similar, so I guess I will leave it alone. My only concern is that this is new, I have never seen it before on my fish. Is that a concern?
The fact that its a new development could be cause for concern.
How long have you had it? Many times fish will be more 'washed out' looking when stressed, or in the LFS, and then their 'true colors' will show up as they become more comfortable in their surroundings.
You've probably just not noticed it before as in some light you'll hardly see it.
As long as the fish is behaving normally then it's best left alone.
To put your mind further at rest google corydoras melini & look at the images most if them show the same colouration