What is the key difference between “ajjilni biha” and “ajjaltuka biha”?

Kitab al-Iqrar: Debt and Trust, Admissions by Reply, and Deferred Debts

• Payment in the former, release from liability in the latter
• Two forms of denial versus two admissions
• Trust acknowledgment in the former, collection in the latter
• The first asks for time; the second asserts granting time