It is one of the most common questions an owner asks, usually with a second report already in hand: if the property is the same, why is the number not?
The purpose changes the question
A valuation answers a specific question, and the question is set by the purpose. Market value for a sale, forced sale value for recovery, insurance reinstatement cost, and value for accounting purposes are four different questions about one property. They are expected to produce different answers.
The date is part of the answer
A valuation is tied to a date. In a market that has moved, two reports six months apart are not in conflict — they are simply describing two different moments.
Evidence and judgement
Where genuine differences appear, they usually trace back to the comparable evidence selected and the adjustments applied to it. This is where experience shows, and it is why the reasoning in a report matters as much as the figure on its cover.