They look exactly the same.
I looked around in Google’s FAQ, but couldn’t find anything about it.
Is there supposed to be a difference?
Answer
Some simple google search gave me the Guidelines for using Noto, and in there you find:
For an Arabic website that needs to use an UI font for UI elements, such as buttons and tabs, that have more strict vertical space.
The design of Noto UI fonts are adjusted to be more vertically compact, a refinement made for user interface typography.
Attribution
Source : Link , Question Author : Dor , Answer Author : Luciano