Simple script thate return the MD5 hash of a files for all tag versions.

md5versions.bash

tags=`git tag -l --sort=v:refname | grep "^[34]\.[0-9]*\.[0-9]*$"`
oldhash="unset"

for tag in $tags; do
    git checkout $tag > /dev/null 2>&1
    md5=($(md5sum $1)) > /dev/null 2>&1
    if [ "$md5" != "$oldhash" ]
    then
        echo \"$tag\" \=\> \"$md5\"
        oldhash=$md5
    fi
done