With the A320's, there is an unusual issue. For some reason, the system on the older A320 uses a 400' ROC value at the FAF, rather than 500' on the newer systems, (and on the 737).
The older A320's had been flying the procedure with no warnings, but the newer models would have a warning. It is very noticeable when the aircraft are on a coded procedure
How the system handles the 200' ROC at threshold, backing it off to where the ROC surface intercepts ground has differences over time and manufacturer.