two different images give no difference!

[dedef]

Hello,

I have two images which seem to be the same, but MD5 checksums and sizes (445009 octets and 445416 octets) are different.
http://imageshack.com/a/img811/1862/gu1m.jpg
http://imageshack.com/a/img842/9313/rtqh.jpg

I tried to compare the both with ImaheMagick (Compare Program), but I get no difference!!!
How is it possible?

Thanks

[snibgo]

The images are identical. The files are different. Files contain more than just images; they also contain metadata.

[dedef]

Tkank you
But how to get metadata? Exif data seem to be the same?

[snibgo]

Exiftool reports changes in just three fields: System:Filename and System:FileModifyDate and System:FileAccessDate.

I don't know why one file has 405 more bytes than the other.

[dedef]

Both images come from 2 different puzzles on the same theme: in fact something is hidden inside, probably directly in the image. So I am very surprised that ImageMagick makes no difference.