I'm Chris, new to the forum (as a poster

Today I saw that there is a compatible new ATmega128A3-AU which seems to have the same pinout and instruction set but runs at up to 32 MHz with less power consumption (about -45%).
Has anybody experience with this processor? Can I just replace my 128-16AU with this one? Is there maybe a chance of running the 9x at 32 MHz?

If I had another board I would test it myself but the chance of breaking my board is big because I already soldered the processor a few times.

Thanks for your time and answers!
ChrisG