Change file creation date to modification date using terminal
To use @user3439894's answer with find, use the -exec command {} + clause, and put the for loop into a sh script:

find some/path -iname \*.img -exec sh -c 'for f in "$@"; do m="$(GetFileInfo -m "$f")"; SetFile -m "$m" -d "$m" "$f"; done' sh {} +


The 2nd "sh" will become the $0 inside the spawned shell, and the .img filenames will be the positional parameters $1, $2, ...