MySQL, right? I remember reading about lots of warnings and incompatibilities between 4.0 and 4.1 (seems like a lot of them involved Unicode support). For the most part, the mysql team just recommended doing a mysqldump to get a backup, changing versions, then loading that dump back in. Since you're asking this here, I'm guessing that didn't work for you. Then again, they also mentioned that there are a lot of issues involved with moving backwards. Are you switching versions on one machine, or do you have a 4.1 database on one machine, and you want a copy of that database on a machine with 4.0? What sort of errors do you get when you try to import the data? (I know, I'm not much help, but maybe the questions will tickle someone's brain cells into coughing up the answers).
yes... its possible... this link may help you... http://www.namepros.com/programming/169681-sql-version-incompatibility-having-trouble-when.html