Chinese IPA: Ẓ

Wasn't really sure who/where to ask this - other than maybe some of the fine folks at Language Log - but I figure the Pleco crowd should have, at least, some idea...

I ran across "Ẓ" use some what in some old texts used as a sort-of "IPA"

then to make sure I wasn't crazy I did a little googling and found:
http://sinoglot.com/wu/2009/09/i-vs-z/
[this]
which usage is not quite the same but at least it is an instance of the "Ẓ" being used as a sort of ipa symbol in Chinese

but my question to you is:
is there a difference between "Ẓ" and "ẓ"?

At least aesthetically a lowercase 'emphatic z' looks better when it is surrounded by everything else that is also - lowercase... but the texts I have are specifically using a capitalized 'emphatic z' so I was just wondering, ya'know...
 
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