No, Expression Web is a totally different beastie. Whereas Frontpage is more aimed at the casual web designer, with templates and bots that could get a simple but pretty site's basic design working in a matter of minutes, Expression Web is aimed at the Dreamweaver fanbase and more geared for CSS and XHTML for Web 2.0
Which is probably why he wants Frontpage 2003. Having used both, I have to say that Frontpage is more friendly, though Expression Web is far more powerful.