Indo and PNG are the same in regards to the total time needed to be in command of a single engine aircraft operating under part 135. You will be required to have 1000 hours single engine time to qualify for PIC. Only a couple of Caravan operators in Indo have two pilots up front so this could be very limiting in your job prospects. No co pilot means no time building to the magic 1000.
The belief that the under 30 seat rule makes the 250 hour rule not applicable seems not to be true. Susi had to apply for an exemption apparently.