No, a letter of apology is very different from a letter of justification. In a letter of apology, one party is offering the individual they wronged an olive branch. The letter of apology is where an individual, group or organization reaches out and makes an attempt at reconciliation. On the other hand, a letter of justification is written when a project cannot meet its milestone. Completing a project depends on many variables, and if one of those variables fails, then the project may be late. For instance, say you had a project where you needed to bake 6 Granny Smith apple pies. You depended on the apples to be delivered on April 5th. However, due to the Coronavirus pandemic, the supplier emailed you and said they won't be available until the 10th. You've tried to contact other suppliers, but all have the same problem. Thus, you'd write a letter of justification to the one who ordered the pies, explaining to them the situation, and attaching documents to back up your letter.