The last stamp names the country
Document legalisation for Mozambique ends with an act performed on behalf of the receiving side. That is what gives the file its weight, and it is also what ties the file to one place. Nothing about the sheets underneath is wasted, but the finished bundle cannot be redirected once that closing stamp is on it.
Where Mozambique stands
Mozambique has not joined the Hague Apostille Convention. Inside that treaty a single certificate is meant to satisfy every country in it at once, which is exactly the reuse people are hoping for. Outside it, there is no apostille issued in Reading for use in Mozambique, and the file stays tied to the one destination it was built for.
Deciding the list before the run
The practical consequence is that the planning happens at the front. Write down every country a paper may have to reach, and every paper each country may want, before a single sheet goes into an envelope. An apostille from the United Kingdom to Mozambique would not remove that planning either, and this route punishes a late addition harder.
Where the doubling shows up
The British stage is charged per document, at £45 for the standard postal service, and it charges again for each new sheet. Two destinations therefore mean two sets of sheets and two sets of charges at that office. Knowing this early turns it into a budget line rather than an unpleasant surprise halfway through.
One run, planned once
What you need for an apostille for Mozambique is, in truth, a plan for a different route and a decision made up front about scope. Fix the country, fix the list, order the certified copies together, and send everything as one batch. A route this long is worth walking exactly once.