Both of my filters used ceramics, though my original ceramics were much larger than the newer filter could hold so I put maybe five good ones out of a bag of maybe 25 in and never had an NH3 spike (there was still trace for a day or two, less than .02ppm). I put both bags into a bucket I was using to hold my fish/plants while I was moving the tank and there was 0 NH3 the entire time. I bet I could have just dropped the bag in the new tank and it would have done fine as well.
If you've got fish that need to move, you could cut some of the sponge off and put it into the filter/tank let the fish feed the bacteria. That is, if the fish you're planning on putting in aren't that sensitive. I briefly moved some "hardy" fish into the new tank because I %&&*ed up my old tank while I was cleaning and was worried the dust would irritate their skin, but about 20 minutes or so later I saw that they had completely lost their color and gills were turning red so I spent another 20 minutes trying to catch them and move them back into the old tank. I tested the water and it was trace amounts of NH3.