Front camera vs distant back camera for FWHR?

[justofeelsomething]

front camera selfie gives 1.66 FWHR, but back camera from a distance gives 1.88. which one is accurate? for example MY ID pic is around 1.85 1.90 but when i take a selfie its like 1.6 to 1.7

 

[Snoofy]

ID is more accurate

 

[sub75iq]

obviously back camera tf and even than use your optical zoom camera if your phone has one like 2x or 5x and stand further away

 

[BebiBimf]

front camera selfie gives 1.66 FWHR, but back camera from a distance gives 1.88. which one is accurate? for example MY ID pic is around 1.85 1.90 but when i take a selfie its like 1.6 to 1.7

back cam with 2m distance