What is the central technical difference between mukaffirah and mufassiqah innovation?

Innovation, Defective Retention, Ikhtilāṭ and Ḥasan li-Ghayrihi

• One denotes a narrator’s book and the other a student
• One always concerns accuracy and the other connection
• One is judged to entail unbelief and the other grave deviation without that classification
• One is a broken chain and the other continuous