K20a2 or k20z1 ??

I just bought this 2006 Rsx type s and the owner said it had a swap I can't tell if it's a k20a2 or a k20z1 engine though can you guys tell what kind it is by the pictures or how do I check what kind of engine it is

Attached Thumbnails

 

K20a2 or k20z1 ??