Moving from SMF to VB , any seo problems like 404
 

hello,
as there is a Impex Tool to do all from smf to VB. Does It causes any SEO issues ? like already my Urls in SEF format . After convertion will Urls Change there format? even though VB has SEF usels they may be some variation in urls?

so that it may cause 404 errors?

Does any issues for SEO after convertion