Basic size comparison in millimeters for:
hull (w/o fenders) and turret length(w/o cage armor, cannon, ERA), tank and turret height (w/o cupola, optics, sensors), hull height:
6750 / 2850 / 2220 / 650 / 1570 - Chonma-ho [T-62]
6910 /2540 / 2190 / 750 / 1440 - T-72A
6930 / 3210 / 3000 / ???? / ???? - M60A1
7300 / 3650 / 2430 / 810 / 1620 - Chonma-216
7230 / 3750 / 2780 / 900 / 1880 - Songun-915
8450 / 4650 / 2630 / 1100 / 1630 - M2020 ( second most conservative )
9200 / 5000 / 2900 / 1190 / 1710 - M2020 ( initial conservative estimate )
* T-62 road wheels and tracks are used by both Chonma-216 and Songun-915.
* I assume M2020 is using road wheels and tracks from T-72 with former being smaller diameter than T-62's.
* possible turret bustle has length of 1250mm at most and at least 900mm depending on where it is measured from.
* M2020 in comparison has at least 1200mm length for possible turret bustle thus perhaps probable if considerably longer than that.
125mm smooth bore cannon barrel of 2A46 outside turret of tank in millimeters:
4400 ~ 4600 - T-72 ( depending on model, turret cheeks thickness of T-72B versus T-72A aka T-72M1 ? )
4600 - Songun-915
115mm smooth bore cannon barrel of 2A20 outside turret of tank in millimeters:
4200 - T-62 ( early model 212mm turret armor )
125mm or 115mm smooth bore cannon barrel outside of turret tank in millimeters ?
5000 - Chonma-216
5100 - M2020 ( most conservative estimate )
5600 - M2020 ( conservative estimate )