Hi Carmen,
Yes you can export/import framework page and theme from the old portal but not sure if it works on 7.4.
For transporting Framework, Desktop and Master rule collection do it like the same way you export/imported the other contents like roles. iView etc.
For theme
In 7.01 System Admin -> Portal Display -> Theme Transport
In 7.4 System Admin -> Transport -> Transport Themes
I think while importing the content from old portal to new portal, you have already replaced the Desktop, Framework Page and Master Rule collection. That is why you are getting Classic FrameworkPage.
Since you are in 7.4 it is always good to modify the standard themes came along with the installation, otherwise you might end up with lot of issues in the UI in future.
Regards,
Suman