Not if the engine remains the same. It’s like newer models of cars that use the same platform. Looks nice, but it’s still the same car. Same engine, same transmission, same drive train, etc.
There is a new engine with version 7, but nothing changed to the guts of the ZoneAlarm firewall, with any version from 4.something to 6.1.744.000. The firewall functions were the same no matter what the version was.
It was all “bells and whistles”, and the change list that David posted reflects that.
Here’s a review of the new engine…
http://www.vnunet.com/vnunet/downloads/2128997/zonealarm
But, I would advise a long-slow-read through the ZA forums before anyone would think about upgrading to version 7.