Did Imam Muhammed narrated all the hadeeth in his Muwatta directly from Imam Malik? And why some hadeeth are contracting between the muwatta of imam Muhammad and imam malik? How much hadeeth does the Muwatta of Imam Muhammad contain?
Muhammad's Muwatta is directly narrated from Malik. Malik changed his book over time, so different narrations have different hadits. Muhammad's Muwatta has between 1-2000 hadits.