They've reduced size in every dimension, here's the 14 inch size from the specs for example:

Oled:

    Height: 1.50 cm (0.59 inch)
    Width: 31.08 cm (12.24 inches)
    Depth: 21.63 cm (8.52 inches)
    Weight (M5 Pro): 1.38 kg (3.0 pounds)
    Weight (M5 Max): 1.40 kg (3.1 pounds)

    Height: 1.55 cm (0.61 inch)
    Width: 31.26 cm (12.31 inches)
    Depth: 22.12 cm (8.71 inches)
    Weight (M6): 1.55 kg (3.4 pounds)
    Weight (M5 Pro): 1.60 kg (3.5 pounds)
    Weight (M5 Max): 1.62 kg (3.6 pounds)