do the octavia vrs seats fit the fabia? thanks

No mate

look at the seats in this fabia

http://www.briskoda.net/forums/topic/237789-what-interior-is-this/

You could do it, but its not a straight swap. You'll need someone good at welding, and be prepared to destroy your existing seats as you'lll need the seat runners etc. to weld onto the Octavia seats having cut the Octavia runners etc. off.