Western formal wear for men includes suits, dress shirts, dress shoes, and slacks. Western formal wear for women includes dresses, dressy jumpsuits, heels or dressy flats.
Indian formal wear for men includes mainly kurtas and sherwanis with matching pants or slacks on the bottom. Indian formal wear for women includes sarees, lenghas, salwar kameez suits, and anarkalis. Examples of men’s clothing: https://www.utsavfashion.com/blog/ensembles/indian-formal-wear-male Examples of women’s clothing: https://www.utsavfashion.com/blog/ensembles/indian-formal-wear-female
While both occasions have a dress code of Indian formal wear or Western formal wear, the ceremony can be slightly more casual than the evening. No need to overthink the dress code! As long as you don’t wear white, it shouldn’t be an issue ;)