Both are identical to the browser on the local machine. The headers you mentioned are the only difference.
The Ctrl+Refresh header means that any caching servers along the way should return a fresh copy of the page.
The Ctrl+Shift+Refresh headers mean that any caching servers along the way should return a fresh copy of the page, and should also not cache the page for any future requests. In other words, the next time the page is requested, it should either use a previous cache of the page or request a fresh copy, but should not use this one.
Pragma: no-cache is the HTTP 1.0 version of Cache-Control: no-cache. There is no HTTP 1.0 equivalent to Cache-Control: max-age=0.
RFC2616 section 14 subsection 9 has relevant information: w3c.org: RFC2616 sec 14.9.1