We have several older IKEA cabinets with door hinges that are not compatible with the new dampers for kitchen cabinet doors. And we found a way to upgrade old hinges with new dampers:
These hinges have a round hole at the back whereas the new hinges have a rectangular hole for the damper to snap in:
After buying some dampers and some new hinges I figured out the easiest solution to install the dampers to the old hinges would be simply filing the hole into a more rectangular shape:
This worked like a charm! Now almost all of our doors are damped and close smoothly.
Note: for doors with more than 2 hinges more than one damper is needed.