Does ICUFoldingFilterFactory make CJKWidthFilterFactory unnecessary?

[Shawn Heisey]

I am using ICUFoldingFilterFactory in my Solr schema.  Now I am looking 
at adding CJKBigramFilterFactory, and I've noticed that it often goes 
with CJKWidthFilterFactory.  Here are the relevant Javadocs for my question:

http://lucene.apache.org/core/4_0_0/analyzers-common/org/apache/lucene/analysis/cjk/CJKWidthFilter.html
http://lucene.apache.org/core/4_0_0/analyzers-icu/org/apache/lucene/analysis/icu/ICUFoldingFilter.html
The descriptions of these two classes suggest that if I already have 
ICUFoldingFilter, I do not need CJKWidthFilter.  Do I have that right or 
wrong?

Thanks,
Shawn