You seem to have forgotten to attach the image to your post!
These “spot the difference” puzzles are very popular and are often based on one of two principles:
Genuine detail: The difference is minimal (e.g., a missing pixel, a different color, or a slight shift in the background).
Psychological trick: The images are actually completely identical, and the caption “If you can spot the difference, you’re a genius” is simply meant to entice people to scrutinize the image for minutes on end, thus increasing the post’s views.
If you upload or embed an image, I’d be happy to take a look and try to find the difference for you!
