There is no essential difference between Lexus and Lexus, they are just the names of the brands at different times.
When Lexus was first imported into China in the 1980s and 1990s, all dealers called it "Lexus". But at that time, Toyota did not announce the entry of Lexus into the Chinese market through official channels. All Lexus at that time were imported by dealers themselves, so the name "Lexus" was actually given by the dealer who represented the car at that time.
It was not until 2001 that Toyota officially introduced the Lexus brand into the Chinese market. In order to distinguish it from the parallel imports through unofficial channels and to re-establish its own brand image, Lexus was renamed "Lexus". ?
Extended information:
Lexus logo
The name Lexus originally meant a symbol of luxury and cutting-edge technology. Previously rejected names also included Eric Alexis and Lexis. Before the official debut, not only the name was considered, but the brand identity was also perfected.
The now-familiar round L-shaped logo has undergone three changes: Lexus used a semicircular L as its logo in the early days, and later the appearance of the logo L changed. In another version, the L is located in the middle of a perfect circle, and the shape is fuller and more prominent. The ellipse around the final version of L is not a perfect ellipse, but a shape obtained after precise calculations.
Lexus official website - brand history
Baidu Encyclopedia - Lexus