How can I train a dataset to find similar shades of a colour?

Hello,

I have thousands of images that I want to train. But I want to know the method that I can use to find the images of the same colour shade through training.

e.g. I input image 1 and the training outputs image 2 and 3 (from the dataset) as their colour is the same as image 1 and only the shade varies.

Image 1:

Image 2:

Image 3:

Best Regards