Iosue
Legend
When did that actually happen? Are you talking about Call of Cthulhu? Because it's the only example that springs to mind.
OD&D + Supplements → AD&D → AD&D 2nd Ed.
OD&D LBB → Holmes → Moldvay → Mentzer → Rules Cyclopedia
There were changes. Sometime big changes, like the boost to dragons in 2nd Ed. But no one will ever convince me that these changes over the years are the same as WotC's rebuilding of the game for 3e → 4e → 5e. I used to play with a Mentzer Basic book and a Marsh/Cook expert. You could use the AD&D adventures and even Monster Manual with D&D. You can't use a 3e MM in 4e. Or a character created for 4e in a 2e game.