Hi Sat,
Yes you can learn CRM abap easily, the main difference between SAP CRM an SAP SRM is the SAP CRM Web Client UI.
SAP CRM Web Client UI is a mix between Abap Webdynpro and BSPs but if you control Abap Webdynpro you have to study somo aspects of infraestructure and use and it's gonna be easy for you.
I meet some recycled people from SAP SRM to SAP CRM.
If you need to study you can get this books:
SAP CRM Web Client Customizing and Development - SAP PRESS Bookstore
SAP CRM: Technical Principles and Programming - SAP PRESS Bookstore
SAP Web Client: A Comprehensive Guide for Developers - SAP PRESS Bookstore
Welcome to SAP CRM!!
Best regards.
