Senegal is about 1.4 times smaller than New Zealand.

New Zealand is approximately 268,838 sq km, while Senegal is approximately 196,722 sq km, making Senegal 73.17% the size of New Zealand. Meanwhile, the population of New Zealand is ~5.1 million people (12.9 million more people live in Senegal).
Tip: This to-scale comparison of New Zealand vs. Senegal uses the Mercator projection, which distorts the size of regions near the poles.