I haven't done this but it should be possible. So:
a) login with user to access v8.2 instance
b) "backup database" command
c) login with user to access v9.5 instance
d) "restore database" command
3. If you will have both versions v8.2 and v9.5 then there is no need of "whole system migration" - so you can migrate one database (see backup/restore in step 2) and 2nd letter.
Hope this helps,