How to assign different sidebars for different pages
Go to Appearance > Contango Options > Sidebar Settings
Add New Sidebar say “Blog” and Save Changes
Go to Pages > Add New
See Sidebar Settings Meta box below the editor
Select Yes to Use Custom Sidebar
Select your newly created sidebar “Blog” from sidebar drop down menu
If you are planning to create page with Right Sidebar than Default Template is fine in the Page Attributes Meta box
If you are planning to create full width page than select Full Width Widgetized Template.
Publish or Update the page
Go to Appearance > Widgets
You will see your newly created sidebar “Blog” there, Now drag/drop widgets in this sidebar.
Now this sidebar is attached to your Blog page and your Blog page will show widgets from this sidebar.