User blog comment:Golurk 88/The Fast Heavy: ARL 44/@comment-34603851-20190121062754/@comment-30076690-20190126190437

KV-1S has a short-barreled 122mm howitzer, a primarily HE gun. The KV-85 has a long barreled 122mm, basically equivilent to the gun on the IS-3 (tier 8). Give or take.