As many of export control professionals are aware, Japanese export control dual-use items list has unique numbering system (e.g. Category 5 part 2 is equivalent to Japanese Category 9), however Japan's list is basically reflecting all of international regimes, therefore 1 to 1 category conversion is possible, certain interpretation difference issues exist, though.
So, for global traders, conversion spreadsheet of EU list and Japan list is quite useful which is available to download from METI web site. (http://www.meti.go.jp/policy/anpo/eulist_taihihyo.html )
As of August 1st, 2012, METI updated this EU-Japan dual-use item conversion list to reflect recent changes both in EU side and Japan side. Updated EU list, REGULATION (EU) No 388/2012, implemented on June 15, 2012 is reflected into this conversion spreadsheet. At the same time, Japanese dual-use control list, which is effective on August 1st, 2012 and reflecting recent MTCR update and Wassenaar Arragement December 2011 list, is also in this conversion spreadsheet.
The update part is highlighted in blue for convenience of traders. If you need to compare Japanese category to ECCN or EU list, this conversion spreadsheet is quite useful tool for traders.