Differences Between SQL Server Versions

Hello,

I've got installed Win 2003 SBS Premium with the SQL Server 2000 on a server
machine. It works almost fine, except the application which uses the SQL
Server. The main part of the application runs (since the last update) fine,
but other tools of that application (database import and the database
manager for check and rebuild) doesn't. They hang up or kill the database.

Our software developer says that these problems are in correlation with the
server os. But there won't be any problem if we install Win 2000 Server and
add an additional SQL Server 2000.

Finally my question is: Are there any differences between the SQL Server
2000 Versions, which are sold (a) as a single product, (b) as part of the
Win 2003 SBS Premium package and (c) as part of other Server versions?

Thanks in Advance,

Martin