Bezels don't impact the screen measurement at all. The two screens are within +- 1% of each other in terms of area.
The Nexus 6P is listed as 2560 x 1440 at approx. 518 Pixels per Inch. Assuming rounding to the hundredth of an inch on the PPI (517.5 to 518.49), the screen is somewhere between 4.9374 x 27773 in and 4.9469 x 2.7826 in and so has an area of 13.7127 in[SUP]2[/SUP] to 13.7652 in[SUP]2[/SUP]. The diagonal of the screen would then measure between 5.6649 in and 5.6758 in. This is between .0110 in and .0326 in longer than the Styles. The Nexus could effectively be labeled as a 5.66 or as a 5.67 inch screen. Both would obviously round up to 5.7 inches.
The Moto X Style is listed as 2560 x 1440 at approx. 520 Pixels per Inch. Assuming rounding to the hundredth of an inch on the PPI (519.5 to 520.49), the screen is somewhere between 4.9184 x 2.7666 in and 4.9278 x 2.7719 in and so has an area of 13.6075 in[SUP]2[/SUP] to 13.6594 in[SUP]2[/SUP]. The diagonal of the screen would then measure between 5.6432 in and 5.6539 in. The Style could effectively be labeled as a 5.64, 5.65 or as a 5.66 inch screen. All three would obviously round up to 5.7 inches.
With that methodology, the 6P is likely between .0533 in[SUP]2[/SUP] (largest less smallest) and .1577 in[SUP]2[/SUP] (smallest less largest) larger than the Style, or between 2.1 mm[SUP]2[/SUP] and 6.2 mm[SUP]2[/SUP] larger. As such the area of the 6P is probably between 0.39% and 1.16% larger than the Style.