The 3UZ-FE dipstick on LS430 is considerably longer than 1UZFE on LS400.
It appears the 3UZ-FE dipstick will fit the 1UZ-FE dipstick tube and can be easily shortened and drilled for high/low mark. Unlike the LS400 with crosshatch pattern and markings, the LS430 dipstick has only two holes for oil level