Paint Gun Help

Just so I'm understanding this correctly, lacquer thinner will eat rubber o rings, but acetone won't? I hope I just learned something! I have a new Devilbis Tekna Pro Lite that I don't want to mess up by cleaning it the wrong way. I've used lacquer thinner to clean spray guns as long as I've had one, and never had a problem. I've always had cheapies until I got this Tekna Pro Lite.