Android BOX - DPI impacting?

Im using android box for multiple screen types,
some are Outdoor LED, the Outdoor LED will have 1920x1080 Screen size reported on EDID, however it may have smaller visiable area.
one way to use it as Window inside the 1080p Layout size.

when using different Android boxes, the window set to the actual visible area of the LED is not allways the acual size.
i have replaced 1 unit today with a different model, and the actual window size i had to specifiy was 30% bigger to fit the entire window to the visiable area of the LED.

does the DPI of the android affect the actual drawing size of the window/content?