What different position of Imam Abu Yusuf and Imam Muhammad does the commentary record when the earlier time of death is unknown?

Well Purification: Required Bucket Counts and Unknown Time of Death

• The well is treated as impure from the time the dead animal is discovered, unless the earlier time is actually known.
• Every earlier prayer of the entire month must be repeated.
• The well remains permanently pure.
• The animal's size alone determines the date of impurity.