New Mexico is about 1.7 times bigger than Cambodia.

Cambodia is approximately 181,035 sq km, while New Mexico is approximately 314,310 sq km, making New Mexico 74% larger than Cambodia. Meanwhile, the population of Cambodia is ~16.7 million people (14.7 million fewer people live in New Mexico).
Tip: This to-scale comparison of Cambodia vs. New Mexico uses the Mercator projection, which distorts the size of regions near the poles.