@errror404
Probably No.
If you have SketchUcation tool's ExtensionStore³ you can make a Bundle of the extensions you have in the previous version.
The in the newer version use that Bundle to add/update all of your extensions in that version - using the newest version available.
Unfortunately it only works for extensions you have installed from SketchUcation.
Any extensions you got direct from a developer's site need re-downloading and installing individually.
Any extension you got from the Extension Warehouse must be re-downloaded / installed.
Their bulk update is no longer available.
SketchUcation ExtensionStore³ also notifies you when updates of your current extensions are available, and lets you install them, individually or in bulk.
You can copy the contents of your Plugins folder from the current to the newer version - however, many developers update their code to suit newer versions, so errors might arise with this method, especially if you haven't update extensions fastidiously.
Don't copy over the su_xxx extensions and folders as these are shipped with each version and you might overwrite a newer version...