How to find small difference between 2 images

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Hello. I would like to compare 2 images and find differences between them even if the difference is very small. I have 2 images ( banana ). The first picture has my reference object which is banana. at second picture, banana is rotated and I put some small marks on it. I would like to find reference banana object at second image and I would like to compare them and try to find small differences .

all suggestions are appreciated.

first image which is my reference image.

Second image which I will try to find banana and compare differences.