After converting the necessary project settingsA broad collection of settings which allow you to configure how Physics, Audio, Networking, Graphics, Input and many other areas of your project behave. More info
See in Glossary and materials from the Built-In Render PipelineA series of operations that take the contents of a Scene, and displays them on a screen. Unity lets you choose from pre-built render pipelines, or write your own. More info
See in Glossary to URP, the overall look of the sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
See in Glossary might still not match the look of the original project.
One reason for this is that the light falloff functions in the Built-In Render Pipeline and URP are different. URP implements inverse square light falloff, while the Built-In Render Pipeline uses quadratic falloff. Changes in quality or light component settings might not be enough to achieve the same look in URP.
To change the light falloff function in URP and make it look similar to the Built-In Render Pipeline falloff, refer to Change the light falloff function in URP.