North Korea never received transfer of technology for T-72 because it never got license for it in first place and they only got at least one example of it between 1985 and 1992 from Iran that captured it from Iraq during Iran-Iraq war of 1980 to 1988 along possibly perhaps maybe T-80BV from Belarus in early 1990's.
All main battle tanks that North Korea has in active service do not have autoloader and have four crew members including Songun-ho that has 125mm smooth bore 2A46 cannon while do keep in mind if thermal sleeve/jacket/shroud was put on 115mm then it would be hard to distinguish between the two without scrutiny.
Another is since Songun-915 has no autoloader thus has 4th crew member that is human loader hence no limit on length of APFSDS which Soviet and Russian main battle tanks have due to carousel autoloader limited by inner turret ring diameter which is not the case with Songun-ho because it is manually loaded along turret ring such as of T-62 that is far larger than T-72 and bigger than both M60 and M1 Abrams.
Longest APFSDS projectile for 115mm is 640mm and can penetrate 500mm at 2km.
Those antitank guided missiles mounted on right side of turret on swivel mount are Bulsae-5 that are clones of Russian 9M133 Kornet and it is possible components of fire control system of that weapon are integrated into commanders cupola sight which includes 1PN79 series thermal optics, laser range finder and illuminator.
From tankograd discord:
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 est )
5600 - M2020 ( conservative estimate )