And as a general rule of thumb - don't mess up your unit conversion or comprehension!
The idea that differences in gravity on different places on the planet is causing differences in standard masses (NOT weights) that represent the kilogram is incorrect.
A rock with a mass of one kilogram on the surface of the Earth would still be one kilogram on the surface of the moon as mass does not change.
However, a rock weighing one point on the surface of the Earth would only weigh 1/6 of a point on the surface of the moon.
You might take a look at:
(Hm, there's more at that link then I ever considered from high-school physics. But at the end-of-the-day, I believe a kilogram is still a measurement of mass that does not change based on gravity.)