Should the dates on the Learning Agreement (LA) be changed if they differ from the initially listed arrival and departure dates?

A small change is certainly not a problem and the dates do not have to be changed on the LA.

You must always report a change in dates, though, to your faculty and the IRO (International Relations Office) to OutgoingStudents@uantwerpen.be

Before you receive your mobility contract the IRO will ask for a confirmation of the dates. The final amount of the scholarship mentioned in the contract, will be the maximum scholarship that you will receive.