Newbie 318 piston question

KB periodically changes their piston designs..... without issuing a new part number.
That’s just a preface to saying, I’m looking at a 2016 catalog, so the info might not be 100% accurate today.

My book shows the KB167 to be a flat top with 5cc valve pockets.

The KB399 has a .200” tall dome that has an effective volume of -6cc.

So, there is an 11cc spread between the two pistons.

Both show a CH of 1.810.