BP Engines	Head Code	Block Code
B6ZE EU/JP (1989-2005) 1.6L	1.6L B61P/B660	1.6L B64J
BPZE (1994-1997) 1.8L	1.8L BPE8	1.8L BP05
BP5A JP (1999-2000) 1.8L	1.8L BP4W	1.8L BP5C
BP4W (1999-2000) 1.8L	1.8L BP4W	1.8L BP5C
BP4W (2004-2005 MSM) 1.8L T	1.8L BP4W	1.8L BP8J
BPZ3/BPVE (2001-2005) 1.8L VVT	1.8L BP6D	1.8L BP5C

Keep in mind that there might be different revisions of the blocks and heads. For example the BP5C block used in BPZ3 has larger thrust bearings than in BP4W.

I´m currently working on gathering more information, the current information is gathered from wikipedia and Mazda´s parts manual. If you have some information that I´m missing, feel free to drop a comment 🙂