In answer to your question: stock replacement, hypereutectic, forged 4032 and forged 2618 all require different clearances. I listed them in order from smallest to largest clearance.
As you can see, there is a wealth of information out there. You really need to measure your cylinders with a decent bore gauge. That will tell you what you need to do.
For example, suppose your pistons were installed with 0.001" clearance. You may be able to use a 2618 piston and hone the walls straight again leaving 0.004" clearance.
This kind of honing isn't easy and in the long run you'd probably be better off going to the next oversize with new pistons.
So you see the condition of your cylinder bores is very important to know before your next step.
R.
http://www.us.mahle.com/media/motorsports/2017-application-guide-final-compressed.pdfhttps://www.uempistons.com/installation_instructions/kb_installation.pdfhttp://www.jepistons.com/PDFs/TechCorner/SCPDrawings/piston_instrc4032.pdfhttps://www.jepistons.com/PDFs/TechCorner/SCPDrawings/piston_instrc2618.pdf 
