Different underpinnings and suspension, among other things. LC is designed and engineered for much rougher roads and usage.It's probably a manufacturing culture issue.
So Sequioas and Land cruisers are super close to the same SUV, just a few differences.
When Toyota built the Sequioa plant here in the US, they brought in the same machines and sourced the materials from the same vendors as their LandCruiser line and the finished goods are nothing alike: sequoios give off a cheap feeling, landcruisers a luxory one. Sequios tend to look like **** after a few years and the Landcruiser still feels new. What's the difference? The people at the plants.