Cropping seems to be the less biased approach.
https://gitea.lemnoslife.com/Benjamin_Loison/Robust_image_source_identification_on_modern_smartphones/src/commit/668057e261a530659a430220a59c2404a88dbfb1/algorithms/context-adaptive_interpolator.py#L13
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Cropping seems to be the less biased approach.
Pad with black make same image size, easing comparing them.
Related to issue: