I'm going to guess there's some very gross exaggeration with this story. KT has 225 rear armor. T3485 has 160 penetration and T3476 has 120, so that's 71.1% and 53.3% respectively. 75 seconds is enough for each of your tanks to fire approx 12 times, so 36 shots.
36 X 160 dmg = 5760. Even if only 1 in 4 shells penetrated - and you'd be expecting much, much more than that- the KT would die.
I know that it look exagerated N
and that why I found that pretty strange
Btw I forgot to save the replay