Alessandro, there are many answers to your questions, in fact there have been massive arguments over the differences. The two most common solutions to the problem is to employ the box model hack (http://www.tantek.com/CSS/Examples/boxmodelhack.html) or, as you mention to load different CSS files depending on the browser.
But, more important than either solution is to clean up your CSS to the point that you may not need to have separate style sheets to account for different browser/platform combinations. While this is not always possible, it is a good goal as it should make your site forward-compatible, cutting down on (re)development down the line. The problems you are experiencing might be solved with a few tweaks to your CSS, which would be much better than adding a hack or browser-sniffing code. If you are using a template that came with eZ publish, look around the forums for some of the solutions already posted to content being shoved to the bottom of a page.
Alex
Alex
[ bald_technologist on the IRC channel (irc.freenode.net): #eZpublish ]
<i>When in doubt, clear the cache.</i>
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