Good news--found EZ-CZ cartridge and loaded one bank each into memory A/B and C/D--not the ones I was looking for, but at least there's something there.
As for retaining memory, one of the 3 AA batteries was dead; the other 2 were approx 1.22 v. with a third @ 1.26 v., the banks survive power down for at least 2 min. So, don't worry about finding.
If anyone else want to know anything about the CZ-5000 while I have it set up, please ask.