Zimbabwe is about 1.4 times bigger than New Zealand.

New Zealand is approximately 268,838 sq km, while Zimbabwe is approximately 390,757 sq km, making Zimbabwe 45% larger than New Zealand. Meanwhile, the population of New Zealand is ~5.1 million people (10.1 million more people live in Zimbabwe).
Tip: This to-scale comparison of New Zealand vs. Zimbabwe uses the Mercator projection, which distorts the size of regions near the poles.