Stock EJ257 is first pic on the upper left. Modified EJ205 S20 head are the rest of the pictures. Head cc should come within 1cc shy of the EJ257 heads.
Being a bit noobish about this, what is the importance of these things? The most I know about it is the little tech article Tomei did with their STI build switching to the EJ20 heads. http://www.tomei-p.co.jp/news/Report-EJ25-V1.html