From version 11.9 to find the color library, right click on the cabinet or countertop and select Attributes, select the Variables tab and click on Textures, make sure to double click on the texture value that you would like to change and browse through the list of textures as shown below to select the new color.
To apply this change on all your base and wall cabinets, you can use the Global Attributes option. Simply right click on the floor plan, click on Global attributes and select the catalog that you are working with and continue to select the wood finish.