New Zealand is approximately 268,838 sq km, while Papua New Guinea is approximately 462,840 sq km, making Papua New Guinea 72% larger than New Zealand. Meanwhile, the population of New Zealand is ~4.9 million people (2.3 million more people live in Papua New Guinea).
This to-scale map shows a size comparison of New Zealand compared to Papua New Guinea. For more details, see an in-depth quality of life comparison of Papua New Guinea vs. New Zealand using our country comparison tool.