This can be very hard to determine. Many times, your neighbor may have a different kind of grass than you lawn. Even different varieties of the same grass can be different shades of green. Soil temperature can also play a part. If one yard has higher or lower soil temperatures it can affect the coloring of the grass. It may also have to do with drainage, watering frequency, when one lawn was last fertilized vs. another lawn and what mixture of fertilizer was used. Slow release fertilizer vs. quick release can affect the lawn. We use both based on the need of your lawn and the time of year we are treating the lawn.