Hi Abdul,
That's a very good question.
To answer it, you need to broaden the horizon a bit from just Navigator and Atlas, and consider Atlas, Ranger, Sentry and Navigator.
In short, all functionalities you have in CDH (using Navigator, Sentry) will be available to you in CDP (using Atlas and Ranger).
Here is a high level mapping of the different tools in our different platforms:
Function | Navigator (CDH) | Sentry (CDH) | Atlas (CDP) | Ranger (CDP) |
Data Lineage | X | | X | |
Audits | X | | | X |
RBAC | | X | | X |
ABAC | | Not Supported | | X |
Of course, Atlas gives you a lot of extra functionalities not available to you before such as a more scalable back-end, open apis for integration, large apache community support.
I recommend exploring our product pages to get a better understanding: https://www.cloudera.com/products/open-source/apache-hadoop/apache-atlas.html