I'm building a forged Neo myself right now, and the different pistons allow for the different cylinder heads, and the relevant compression ratios. Got to run the correct piston to suit the head, if you want the package and known compression ratio to be simple, and easy to tune etc. Blocks should be same.
Do some research on oil gallery restrictors (in the deck of the block) as well, as their configuration depends on the head you're running as well (VCT or non-VCT). Platinum Racing Products has a good diagram on their Insta page explaining this...
I'm not a guru yet, so confirm what i've suggested elsewhere as well. But as far as i can tell, get those couple things right, and you should be sweet.