</font><font color="blue" class="small">( Does a county or state line supersede any deed description that would disagree with the county or states interpretation of the line? )</font>
You can quitclaim any thing you like. If it is complicated, like the description is written to a County Line that is in dispute, bring in a surveyor to write a new legal description that does not reference the County Line, and both of you quit claim to that. For example, he might describe that part of the County line by metes and bounds, without ever saying it's the County Line.
The County Line may then move onto one of yor properties if they ever sort it out, but they may never bother to spend the money.
In the end, if no one can agree, and the third surveyor doesn't agree with the first two, it gets settled by the Court when you sue each other. Then someone gets to write yet another new legal description. That's expensive and seldom done, but it's the final resort.
You can sure a surveyor for errors and ommissions (i.e real mistakes like a mis-read angle). But differences in judgement are not generally actionable.