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Similar Tilt
The primary reason that the seasons are similar on Mars and Earth is that both planets' axes have similar tilts: 25.19 degrees for Mars and 23.5 degrees for Earth. Because of the tilt, the sun shines on the northern hemisphere differently than it does the southern hemisphere. The sun bathes one hemisphere in sunlight during one part of the year -- the summer -- when the tilt causes it to be more exposed to the sun, and sunlight is limited when the planet is on the other side of the sun, exposing the other hemisphere to more sunlight.
Similar Day Length
Mars' distance from the sun is much greater than Earth's, therefore the year is much longer, but the planet spins at roughly the same rate, meaning that the two planets' days are about the same. A Mars day is about 1.03 Earth days long. As a result, while the seasons would be twice as long, the similar day length might make the seasons seem even more similar if humans were to colonize the planet.
Similar Eccentricity
Both planets' orbits around the sun are somewhat elliptical or "eccentric," meaning that both planets have seasons that are somewhat uneven in length. However, the difference is much more pronounced on Mars, which possesses an eccentricity of nearly 10 percent, compared to less than 2 percent for the Earth.
Significant Differences
Despite their similarities, there are also great differences in the seasons on Earth and Mars. Temperatures during the seasons are much more extreme than those on Earth to the point that humans could not survive them. And because Mars is closest to the sun during the summer in the southern hemisphere, its southern hemisphere has much more extreme fluctuations in temperature.