Same CTC, different tax
Basic salary is fully taxable. HRA can be partly exempt if you pay rent and you use the old regime. Special allowance is fully taxable. Employer EPF, NPS, and superannuation are exempt until they together cross ₹7.5 lakh. ESOPs from an eligible startup can wait before the perquisite tax is due. The HRA page has the rent test. Employer NPS is Section 80CCD(2).
Take the same ₹20 lakh CTC. ₹12 lakh basic plus ₹8 lakh special allowance is taxed more than ₹10 lakh basic plus ₹6 lakh HRA plus ₹4 lakh special allowance, if you pay rent in a metro and you use the old regime.
What to ask
Ask for the split, not only the total. Payroll will tax the lines on the offer letter.