Exact same time is practically impossible.
Because other nodes may timestamp it slightly differently as a result of clock drift or network delays or even miners discretion.

Like PrimeNumber said,  you can aim to have your transaction included in the same block by pushing with an attractive fee( not a sure solution, but it's one of the best you can get Imo) .
This will make it difficult to determine the exact order within that block and they would both appear the same.