Some changes were made on the Supertest.
Challenger
Turret traverse speed: 18 °/s
Max. speed: 52 / -20 km/h
Gun: 2-pdr AT Gun Mk. II (this might be a typo, but who knows yes it was a typo, look at the bottom of the article – it’s a new gun btw.)
Damage: 280 / 280 / 370
Penetration: 220 / 252 / 47
Reload speed: 7,8 s
Accuracy: 0,35
Aim time: 2,0 s
Gun depression: -10
FV4004 Conway
Turret traverse speed: 18 °/s
Max. speed: 50 / -20 km/h (from 35/-20)
Gun: B.L. 5.5-in. AT Gun
Damage: 600 / 770 / 770
Penetration: 260 / 200 / 70
Reload speed:: 14,4 s
Accuracy: 0,38
Aim time: 2,4 s
Gun depression: -10
FV4005 Stage II
Turret traverse speed: 16 °/s (from 12)
Max. speed: 50 / -15 km/h (from 35/-12)
EDIT: The Russian image this all was sourced from was a bit off, so here’s the translated one.