Trans and clutch changes between 1998 and 1999?

[npower]

I am trying to figure out if there was a change to the trans and clutch package between the 1998 NG900 and the 1999 9-3. My main area of question is the clutch pressure plate interchangeability and will the diff be the same between a 98 and a 99 and interchangeable. Not the gearing just the physical diff and internal diff parts.

For what it's worth I have a 99 looking to use some parts that say for "94-98"

Thanks!