Compatibility summary
You will need a travel adapter in Papua New Guinea; plug types used there differ from Sweden.
Plug comparison
Sweden plug types: C F
Papua New Guinea plug types: I
There is no common plug type between Sweden (C F) and Papua New Guinea (I). You need a travel adapter.
Voltage comparison
Sweden: 230V, 50Hz
Papua New Guinea: 240V, 50Hz
Voltage difference is within a range many devices tolerate; check your appliance label.