Chemi-con aluminium electrolytic / polymer capacitor supplemental codes and their meanings

Only the last digit is different in these part numbers. This is what those digits mean.

The last digit is referred to as the supplemental code. You can find an explanation of its meaning by opening the data sheet and scrolling to the links at the bottom. One of these links will take you to the “Part Numbering System (Appendix)”. The relevant information can be found on the last page of that document.