Of course, there are probably some very objective reasons for this difference.
- How densely populated were the two areas hit by the earthquakes?
- How sturdy and "quake-proof" were the buildings?
Haiti is a poor, corrupt and disorganized country. The chances are that the government isn't very accurate in any of its population counts, and that makes it much easier to falsify, inflate, exaggerate death tolls.
The lower the official figures are in Chile, the more inaccurate the Haitian ones seem.