RomulanS13

I recently bought an s13 that originally had a single cam and the previous owner swapped it with supposedly a s14 ka. Swapped over all the s13 dual cam stuff like the intake manifold ignitor or coil pack and the distributor and I acquired and s13 dual can harness.

My question is how do i know its really an s14 ka. I need to replace a freeze plug that looks like it had been leaking and I also want to build the bottom end for boost. Dont want to buy the wrong pistons unless all the dual cam pistons are the same size.