Tone rings

I understand it to be that the 4.7L Powertechs from 2002 on have a 32 tooth tone ring and prior to that they are using a 16 tooth tone ring. I also understand that it is possible to swap the tone rings. Aside from swapping, can you get your PCM flashed or get a new PCM to use a 32 tooth tone ring engine in a truck that originally came with a 16 tooth tone ring powertech? Thanks.