IOS XR : multicast-routing v router pim

what is the difference between these commands -- If I enable multicast routing on those interfaces-- pim is enabled anyway, so should I also also enable pim in addition to mcast routing   or is that pointless?

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multicast-routing

 address-family ipv4

interface Loopback0

 enable

!

 interface GigabitEthernet0/0/0/0.315

 enable

  !

  interface GigabitEthernet0/0/0/0.416

enable

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router pim

 address-family ipv4

interface Loopback0

   enable

!

 interface GigabitEthernet0/0/0/0.315

 enable

   !

  interface GigabitEthernet0/0/0/0.416

 enable

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