do tile server and nominatim server installation using the same data importing

I want to build a server that provides maps, reverse geocoding and search, I am a newbie to this field and I have tried separate tutorials to build OSM server then Nominatim server on the same box , I saw all of them importing the same OSM data into PostgreSQL database . Now, my question is: is it the same data processed in the two methods? or Do I have to go through the same process of importing data in the two cases? what I think is that, OSM data is imported to PostgreSQL in installing OSM server the same way as it is imported in installing Nominatim server nad the different resides in using rendering tiles in the first and finding addresses in the second. am I right in this ? if that the case, then we can use the same database for the two servers but with different tables . appreciate any help