It depends if the job inherits the signon or signed on by a USER= or PASSWORD= by the JOB card.
Inheritence is when Top Secret imbeds signon information into the job and used to signon and the USER= or PASSWORD= on the JOB card.
If a job inherits the signon, there is no password validation. No password validation means it doesnt matter if the system is running UPPER or MIXED case passwords.
If the batch job signs on, look for a USER= and PASSWORD= on the job card. If not there, then the job inherited,
If there is a USER= and PASSWORD= is on the JOB, password validation will occur and the password case will matter inorder for the password to match on the remote node.