Sorry, my mistake. After checking thoroughly thru multiple sources, YES, the dimensions are similar. I can't seem to be able to locate the video that i saw earlier. Maybe i was mistaken it with taller bezels, not dimensions. Arrangements of the buttons and camera bump and FP scanner not sure whether it's identical or not. If Xiaomi is recycling excess stock of 5X to the A1, everything on the outside should be similar as well.

I notice he compared with note 4, g5, oneplus 5 but not mi5x?
Did I missed a previous video?

Spot on. He compared the redmi Note 4 and the Mi A1 and came to a conclusion that the dimension was roughly the same as Iphone 7 Plus. I didn't notice any comparison dimensions test by Geekyranjit between the Mi 5X and the Mi A1.   

Mi 5X is 5.15" while Mi A1 is 5.5" yah...... 

mix with mobile data with 2 sim on
the screenshot was taken at home

Aivihc

You're nice lo, because your cellular reception is good. Better cellular reception = better battery life, it's tested and proven in XDA. Even when you're not using Internet 2G/3G/4G, the reception has an effect on battery life.