8.1 RELEASE to 8.1 STABLE - ports

No. It's very rare that you have to re-compile ports when upgrading minor versions (6.x to 6.y, 7.x to 7.y, 8.x to 8.x, etc). It's only when upgrading major versions that you have to (6.x to 7.x, 7.x to 8.x, etc).
 
Just to be sure, read /usr/src/UPDATING. If there are ports that need to be rebuild it'll be mentioned there.
 
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