In that case it's unlikely to be a leading/trailing shoe issue; sounds hydraulic - something leaking or not bled properly. Could be other things too. When it goes back for the drums tell them the pedal is soft and they'll fix it.
The pad material is offset differently as usual for leading/trailing shoes and also the adjuster pins - the bits on which the adjuster snail gears run - are in slightly different positions.
When I went looking for pictures 
I found this helpful site. It refers to 109" Land Rovers but the Perentie/110 rear brakes are the same.
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