Well, honey, a kilogram is a kilogram, whether it's feathers, rocks, or even unicorn tears. They all weigh the same because that's just how the metric system works. So, grab yourself a scale and weigh those feathers and rocks - you'll see they tip the scales at the same weight.
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They weigh the same.
Since they both have a weight of 1kg one cannot be heavier than the other.
Pebbles are heavier because they're rocks. Feathers are lightweight and fur.
A kilogram is about 2.2 times heavier than a pound.
A kilogram is a measure of mass therefore a kilogram of lead and a kilogram of feathers have the same mass: one kilogram. They would, however, have different volumes and densities.