Can I swap one set of .030 over pistons for another, without machine work?

Most people dont have a cylinder bore gauge in their tool box since a decent one is over $400, thus the recommendation to take to machine shop. Most guys dont have ability to swap pistons unless you old ones are floating and the KB are floating as well. Its cheap insurance to spend a hundred or two with a real engine builder/machinist and make sure everything is 100%. Taking **** apart twice sucks!
If everything is good, it should be cheap and if its not, its cheaper than blowing **** up thats set up wrong.