Can I remove this?

[rakicko]

Hi,i converted on same datebase first smf to phpbb3 then phpbb3 to mybb and now i am back to smf.. so my datebase is hudge now,can i remove from my datebase now file that are on phpbb3 and mybb?and did that will affect my smf forum?

[xenovanis]

Check the database name and tablesprefix your database is using in Admin -> Configuration -> Server Settings -> Database and Paths.

Don't delete any of those. They are used by your current forum. Anything else can be removed, I suppose. Make a backup though, before you proceed