Как писал Стивен Китт, эти пакеты имеют разные описания:
Вы всегда можете перепроверить содержимое пакета deb.
libbind9 -161 пакет включает общую библиотеку libbind9.so.161 и libdns1104-libdns -библиотеки pkcs11.so.1104 и libdns.so.1104.
$ apt-get download libdns1104 libbind9-161
$ dpkg -c libbind9-161_1%3a9.11.5.P4+dfsg-5_amd64.deb
drwxr-xr-x root/root 0 2019-05-03 20:44./
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/lib/
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/lib/x86_64-linux-gnu/
-rw-r--r-- root/root 71616 2019-05-03 20:44./usr/lib/x86_64-linux-gnu/libbind9.so.161.0.0
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/share/
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/share/doc/
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/share/doc/libbind9-161/
-rw-r--r-- root/root 26678 2019-05-03 20:44./usr/share/doc/libbind9-161/changelog.Debian.gz
-rw-r--r-- root/root 189777 2019-02-05 02:06./usr/share/doc/libbind9-161/changelog.gz
-rw-r--r-- root/root 6973 2019-05-03 20:44./usr/share/doc/libbind9-161/copyright
lrwxrwxrwx root/root 0 2019-05-03 20:44./usr/lib/x86_64-linux-gnu/libbind9.so.161 -> libbind9.so.161.0.0
$ dpkg -c libdns1104_1%3a9.11.5.P4+dfsg-5_amd64.deb
drwxr-xr-x root/root 0 2019-05-03 20:44./
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/lib/
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/lib/x86_64-linux-gnu/
-rw-r--r-- root/root 2355984 2019-05-03 20:44./usr/lib/x86_64-linux-gnu/libdns-pkcs11.so.1104.0.2
-rw-r--r-- root/root 2339312 2019-05-03 20:44./usr/lib/x86_64-linux-gnu/libdns.so.1104.0.2
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/share/
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/share/doc/
drwxr-xr-x root/root 0 2019-05-03 20:44./usr/share/doc/libdns1104/
-rw-r--r-- root/root 26678 2019-05-03 20:44./usr/share/doc/libdns1104/changelog.Debian.gz
-rw-r--r-- root/root 189777 2019-02-05 02:06./usr/share/doc/libdns1104/changelog.gz
-rw-r--r-- root/root 6973 2019-05-03 20:44./usr/share/doc/libdns1104/copyright
lrwxrwxrwx root/root 0 2019-05-03 20:44./usr/lib/x86_64-linux-gnu/libdns-pkcs11.so.1104 -> libdns-pkcs11.so.1104.0.2
lrwxrwxrwx root/root 0 2019-05-03 20:44./usr/lib/x86_64-linux-gnu/libdns.so.1104 -> libdns.so.1104.0.2