Exactly, IMO. 
- Digipak is made of cardboard but has a plastic CD tray glued on one of the panes
- Cardboard sleeve is without any folds, no panes, just a pouch for the CD to slide in
Like the Vynil singles - Gatefold are cardboard with panes and folds. One of the panes is a pouch for the CD
Like two fold Vynil albums