Difference Between Crosscheck Backup and Crosscheck Backupset

I am using 10gR2 on Solaris 5.10
I have a following RMAN script:
run
backup database;
crosscheck backupset;
crosscheck backup;
}What is the difference between Crosscheck Backup and Crosscheck Backupset? Can we just specify crosscheck backup?
regards

CROSSCHECK BACKUP - this command check all backup set and image copies
but CROSSCHECK BACKUPSET check only backupsets

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