Are there other constitutional articles that guarantee non-discrimination?
Yes, there are other constitutional articles that guarantee non-discrimination. Some of them include:

16. Abolition of untouchability: Untouchability is abolished and its practice in any form is forbidden. The enforcement of any disability arising out of Untouchability shall be an offence punishable in accordance with law.

23(1)(a): All citizens shall have the right to move freely throughout the territory of India.

39(a): To ensure that the state does not take away or abridge the rights guaranteed by this Part of the Constitution.