Which morphological distinction separates Karuma from Samiʿa?

Properties of the Six Basic Triliteral Forms: Contest, Transitivity, and Semantic Patterns

• Samiʿa is not triliteral
• Karuma has no imperfect
• Karuma is فَعُلَ يَفْعُلُ; Samiʿa is فَعِلَ يَفْعَلُ
• They have identical patterns