SR20DET VTC piston part number

[jkrlox]

I bought this set of pistons with its matching set of rings for my rebuild of an SR20DET VTC 1997 JDM engine

Nissan A2010-75F76 Genuine OEM SR20DET .2mm Oversized Piston with Pin & Lock

http://www.frsport.com/Nissan-A2010-75F76-Genuine-OEM-SR20DET--2mm-Oversized-Piston-with-Pin---Lock-_p_32894.html

Even when I did search in this forum and google, can't find too much about pistons part numbers.

According to the web site this pistons fits s13 SR20DET, but I thought all SR20DET pistons were the same.

First question: Will this fit my SR20DET black top JDM engine?
Second question: Is it recommended to change pistons and rings, for this oversized pistons?, I can still keep my original pistons and just change rings according to the repair shop.

Thanks!