SMT Electrolytic Capacitor with no Voltage Rating

The “Z” is likely calling out a Series name or manufacturing location. It appears that it would still be a 100uF 16volt capacitor.

Hi everyone.
I need you to confirm my opinion, i have been working with both of those capacitors for almost 7 years. The producer’s and seller’s labels were:

100
16E
stands for 100 uF 16V E00

100
16Z
stands for 100uF 16V L00 (LSR)

But now, after 7 years in which they’ve always been the same, they changed.
This can be a mistake, but I need to know what datasheets means with “SERIES”.