Have you tried using a a meatal coat hanger thro the existing holes?
Several strategies;
Straight to determine if a depth exists behind the 15mm? thick plaster board.
Straight to see what the next solid object is made of.
Bent to test the the clear radius behind each existing hole - that should allow you to determine whether studs, metal framing or dot and dab has been used for fixing plaster board panels.
Removing existing existing plugs (if straight)should be easy. if expanding with crushable/compressing ears maybe a little more difficult.
Or just buy a stud finder - buying man toys is cheaper than employing a real man.
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