LNER London Kings Cross to Edinburgh Waverly Oct 2, 2023 (and back Oct 5) - Strike and Maint

I’m using my Eurail pass for a trip from London Kings Cross to Edinburgh Waverly on Oct 2 and returning October 5, 2023.   It looks like a strike and maintenance will cause “reduced services” and possibly some cancelled trains.  I made seat reservations via GWR a couple of months ago for both trips.  Typically, when there is a strike or maintenance causing service disruptions, do Eurail pass holders get bumped in favor of ticket holders who have paid full fair?   Or can I count on my seat reservations (which were free) to be valid?   If the train I am scheduled to take gets cancelled, but there are other trains operating, are my Eurail pass and seat reservations going to help me get on another train or are pass holders out of luck when strikes and maintenance curtail services?  I have first class global pass, does that help?  Any insights would be appreciated.   What a way to start my 3-month journey!