programmatically distinguish between locked password and locked User

When locking a users password I see two "!!" in /etc/shadow:
[root@RH7 ugu5ma]# cat /etc/shadow | grep test01
test01:!!xxxxxxxxx

When locking a users account I see one "!" in /etc/shadow:
[root@RH7 ugu5ma]# cat /etc/shadow | grep test01
test01:!xxxxxxxxx

Am I correct with my observation ?
I haven't found any detailed info in the docs and kb's..

If so I will go ahead and create a bash-script to check the users-status.

Thanks in advance
ugu5ma2