lsns reports different output based on user running it

The output of lsns looks different based on the privilege of the user running it. ubuntu user and root user get different results: ubuntu@ubuntu:~$ lsns NS TYPE NPROCS PID USER COMMAND 4026531834 time 6 134628 ubuntu /lib/systemd/systemd --user 4026531835 cgroup 6 134628 ubuntu /lib/systemd/systemd --user 4026531836 pid 6 134628 ubuntu /lib/systemd/systemd --user 4026531837 user 5 134628 ubuntu /lib/systemd/systemd --user 4026531838 uts 6 134628 ubuntu /lib/systemd/systemd --user 4026531839 ipc 6 134628 ubuntu /lib/systemd/systemd --user 4026531840 net 6 134628 ubuntu /lib/systemd/systemd --user 4026531841 mnt 5 134628 ubuntu /lib/systemd/systemd --user 4026532290 user 1 134689 ubuntu /usr/bin/podman 4026532291 mnt 1 134689 ubuntu /usr/bin/podman ubuntu@ubuntu:~$ ubuntu@ubuntu:~$ ubuntu@ubuntu:~$ sudo lsns NS TYPE NPROCS PID USER COMMAND 4026531834 time 115 1 root /sbin/init 4026531835 cgroup 115 1 root /sbin/init 4026531836 pid 112 1 root /sbin/init 4026531837 user 113 1 root /sbin/init 4026531838 uts 112 1 root /sbin/init 4026531839 ipc 115 1 root /sbin/init 4026531840 net 115 1 root /sbin/init 4026531841 mnt 101 1 root /sbin/init 4026531862 mnt 1 25 root kdevtmpfs 4026532284 mnt 1 414 root /lib/systemd/systemd-udevd 4026532285 uts 1 414 root /lib/systemd/systemd-udevd 4026532286 mnt 1 469 systemd-timesync /lib/systemd/systemd-timesyncd 4026532287 uts 1 469 systemd-timesync /lib/systemd/systemd-timesyncd 4026532288 mnt 1 572 systemd-network /lib/systemd/systemd-networkd 4026532289 mnt 1 608 systemd-resolve /lib/systemd/systemd-resolved 4026532290 user 1 134689 ubuntu /usr/bin/podman 4026532291 mnt 1 134689 ubuntu /usr/bin/podman 4026532292 mnt 1 5369 root /usr/libexec/upowerd 4026532293 user 1 5369 root /usr/libexec/upowerd 4026532295 mnt 2 134974 root unshare --fork --pid --mount-proc /bin/bash 4026532296 pid 2 134975 root /bin/bash 4026532297 mnt 2 134981 root unshare --fork --pid --mount-proc /bin/zsh 4026532298 pid 1 134982 root /bin/zsh 4026532345 uts 1 655 root /lib/systemd/systemd-logind 4026532346 mnt 1 631 root /usr/sbin/irqbalance --foreground 4026532347 mnt 1 655 root /lib/systemd/systemd-logind 4026532348 mnt 1 678 root /usr/sbin/ModemManager ubuntu@ubuntu:~$ Furthemore the name of Ubuntu system's init process is different: systemd vs /sbin/init. What is the reason for this ? Thanks.