Arjun is a bigger tank when compared to T-90 and it’s quite obvious not only from outside. Even the insides are completely different. Inside T-90 there is hardly any room for movement or even partial stretching of limbs. Arjun on the other hand is spacious and much more comfortable. See for yourself in the pictures. Unfortunately too many pictures came out bad due to incorrect camera settings and shortage of time.
Next pictures are of T-90. Except for 1st 2 pictures of this upgraded T-90S, rest are of a T-90S Bhishma operated by Indian army.