To FCP with 720P (there is no 24pA) the sequence would most likely be the same, 23.98, the difference is on ingest. If you shoot 24P you strip out the duplicate frames leaving what is the same as that would have been recorded 24PN. The one major difference is the frame TC. WIth 24PN you will get , 00,01,02,03… and so on. With 24P after you ingest and remove the dupiicate framers you will see 01,02,04,07 and so on (note actual numbers as not meant to be the actual numbers)
The difference would be if you wanted to shoot 24P but edit that in a 60P timeline, the footage shoot in 24P and then ingested WITHOUT removing the duplicate frames would drop right in.
An other way to putting it is that the 24P records the same frames as 24PN but it imbeds it into a 60P stream.