Yes, it's not same and is something akin to India's caste discrimination. Besides, it complicates things. Tomorrow, what if the Pakistani state declares Wahabis and Salafists as non-Islamic? Do we pass an amendment to accommodate them too?
If your aim is to protect all people against religious persecution, of course you should keep your list of persecuted groups up to date and extend protection to Wahhabis and Salafists if they need it. Ideally, that process shouldn't require amending the original law, but only a judicial decision that (whatever specific actions are taken against the persecuted group) constitute religious discrimination according to the criteria outlined in the law.
What do you think Religious persecution is? Ahmedis have been declared non Muslims and are being prosecuted. This is the definition of religious prosecution
As per the Indian Government, they are still Muslims and the conflict is sectarian. I do hope that they're somehow rescued from Pakistani state's oppression. But it's understandable why they are not covered in CAA.
