The further away from the equator the coffee plant, farm or crop is located, the lower the altitude needed to obtain a given density. For example, a coffee grown in the Jimma region of Ethiopia at 2000 masl with a latitude of 7º North can have the same density as a bean grown in the Nuwakot region of Nepal at 800 masl with a latitude of 27º North. Both coffees are Arabica and will have exactly the same density. Although in this case the difference in quality will be determined by other factors, such as atmospheric humidity, rainfall pattern, soil quality, variety, processing, among others. It is not necessarily the height at which a coffee is grown that determines its particular density, let alone its overall quality.
Information is power and we must deliver it in the most complete way possible. Enjoy your coffee!