Check that 2 debian packages have the same files

check-deb-match.sh

#!/bin/bash

FIRST_TMP=$RANDOM
SECOND_TMP=$RANDOM

mkdir -p $FIRST_TMP $SECOND_TMP

cp $1 $FIRST_TMP
cd $FIRST_TMP
ar vx $1 > /dev/null
tar xf control.tar*
cd -

cp $2 $SECOND_TMP
cd $SECOND_TMP
ar vx $2 > /dev/null
tar xf control.tar*
cd -

diff <($FIRST_TMP/md5sums) <($SECOND_TMP/md5sums)

if [ $? -ne 0 ]; then
    echo "Packages don't match."
    exit 1
else
    echo "Packages match."
    exit 0
fi

Or just use debdiff, duh