Hi Deb, here's some information that may help you.
This might help! https://www.youtube.com/watch?v=ZTFxUUUGjJE
How to Add Soft Close to Existing Cabinets
Here's another helpful video: https://www.youtube.com/watch?v=ASiFTW3LTbQ
Here is a video to help you with this. https://youtu.be/TGceyvzBWvk
Best bet is to get hinges that match existing hinges.
here is how we did that project: https://www.charlestoncrafted.com/make-cabinet-drawer-slow-close/
If you already have European-style concealed hinges on your cabinets, you can probably replace them with soft-close models. Blum's Blumotion, Salice's Silentia, and Grass's TEC may do the trick. Soft-close pistons built into the hinge cup or onto the arm ensure a slam-free closure.
Add a plunger. If you can’t find the right hinges, or don’t want to swap out the ones you have now, you can always install plunger-style pistons, But they are about $10–$15 apiece, these screw onto the face frame or side panel, or into a hole bored into the cabinet, to slow the door as it closes the last inch or so. They work on just about any door with a snap-close hinge.
With soft close hardware you need to make a hole for the hinge to sit i