Comoros is about 3.9 times bigger than Isle of Man.

Isle of Man is approximately 572 sq km, while Comoros is approximately 2,235 sq km, making Comoros 291% larger than Isle of Man. Meanwhile, the population of Isle of Man is ~91,382 people (785,055 more people live in Comoros).
Tip: This to-scale comparison of Isle of Man vs. Comoros uses the Mercator projection, which distorts the size of regions near the poles.