Is it considered a lower-end version of the Lincoln Navigator?

The GMC Yukon is the mid-range version of the Cadillac Escalade, and the Chevrolet Tahoe is the lower-end version of the Cadillac Escalade.

The convoy in "Sicario 2: Day of the Soldado" is indeed a Tahoe.

Chevrolet, GMC, and Cadillac are positioned from low to high. Corresponding models: Chevrolet Tahoe, GMC Yukon, Cadillac Escalade Ford Expedition, Lincoln Navigator General Motors (GM) has an additional middle brand, GMC, compared to Ford. You can also think of Buick in China as similar to GMC.

The configuration is slightly higher than the Navigator [I want to be alone].

Entry-level version of Kaiser Ray

Chevrolet is not considered a luxury brand like Cadillac, but it's okay when compared to Ford.

They are not from the same company, and the lower trim of the Navigator should be the Aviator.

Definitely not. This car is more famous than the Navigator in the US.