Are Call of Duty Black Ops and Modern Warfare in the same universe?

Call of Duty®: Next: Call of Duty®: Modern Warfare® II Multiplayer Brings the deepest, most innovative MP experience yet

CALL OF DUTY: WORLD AT WAR & BLACK OPS & MODERN WARFARE 2 & 3 Playstation 3 PS3

All Call of Duty games in order - Dexerto

Will There Be a Call of Duty Having Modern Warfare's Task Force 141 Taking On the Black Ops Characters? - EssentiallySports

Black Ops Cold War x Modern Warfare 2019 Are they in the same universe and timeline? - GameRevolution

PS3 Call of Duty Game Lot! World at War Black Ops Modern Warfare 2 Complete Test

The Future of Call of Duty®: Warzone™: Continuous Support For Modern Warfare and Black Ops Cold War

My take on the timeline : r/blackopscoldwar

Modern Warfare 3 Zombies teaser hints at ties with Black Ops Cold War universe