I have 99 SiR (your SI) doors on my 97 civic hatch for the power windows and locks, they fit fine (ek to ek)... sedan panels wont fit though, the doors are physically smaller
The integra seats won't bolt up to your body however, you will need to change the rails to those off of your stock civic seats... (94+ teg has same mounts as 92-95 civic)
I don't believe the door panels off of the integra's fit in the civic's though, the center arm rest does but the colour is off but I think thats the only part.