Help: Anthem STR Integrated preamp section vs. Anthem STR preamp

Hi all, I’m having trouble really finding good info about this.

I currently have the Anthem STR Integrated Preamp. But wondering if I should sell it and just get the STR preamp and use my PS Audio m700 amps.

My main question is, what are the main differences in the preamp sections? Different dac? Different processing?

I’m not totally comfortable understanding everything on their spec sheets.