d15b/d16z6 differences

A buddy of mine is doing a n/a build on a JDM D15B vtec. I'm just curious as to what parts are different and what parts are the same. Are there parts that we could order for a z6 that would work (pistons? rings? etc). I've been doing some research and havent been able to gather too much information on this subject. So I figured I'd come ask the people on here cuz I know at least one person will know alot more than I do about this. Thanks in advance for your help. Josh.