rsync: check size or checksum only, ignore owner, group, perms and timestamp

• rsync -avz --no-perms --no-owner --no-group --no-times $@
  

• rsync -r $@
  

• Check only file size:

  rsync -r --size-only $@
  

• Check only checksum:

  rsync -r --checksum $@
  

  or

  rsync -r -c $@
  

see also

• rsync ignore owner, group, time, and perms