Compare the plug shapes, voltage and frequency in Saint Kitts and Nevis and Papua New Guinea, and find out which adapter you need before you travel.
Adapter required
Yes — coming from Saint Kitts and Nevis, you will need a travel adapter for Papua New Guinea. Saint Kitts and Nevis uses Type A/Type B/Type G plugs, and Papua New Guinea uses Type I, so the pin shapes will not fit any wall socket. The mains frequency is also different (60 Hz vs 50 Hz). This rarely matters for electronics but can affect motor-driven devices like clocks and shavers.
Saint Kitts and Nevis (home)
Papua New Guinea (destination)
Electrical specifications in Papua New Guinea
More about plugs in Papua New Guinea
In Papua New Guinea, the standard power plug is Type I. The country runs on 240 volts at 50 Hz. That means every wall socket in Papua New Guinea is the same shape — Type I, and your plug needs to physically match the socket to fit.
Full Papua New Guinea plug guide