Depending on several factors, color match, hole prep, the plug material itself, but you can generally still tell were a ball has been plugged.

I would prefer to not roll over plugs.

One is the plug material is different than a cover stock  material and two generally the plug is not perfectly round like the ball even after resurfacing.

I know several that have plug work in balls, none that I have seen have caused them any problems. As long as the work was done right, resurface job done well, I wouldn't see a problem. None anyway from the ones I have seen.
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AZ Guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.com

Sleep is over rated.