Legal Question in Civil Litigation in California

You can use the requests for admissions in a second case, but not the same way.

An admission in one case would remain an admission. At trial or in a motion, you would just need to lay a proper foundation for the responses to RFA's and get past any hearsay objection that may be applicable.

On the other hand, you would not be able to have the cost-recovering portion of the RFA's. In the case where the RFA's originated, a party can recover the cost of proving a fact that was denied in response to and RFA. That rule would not be applicable in the second case.

Nevertheless, the original RFA's could be an effective method of impeaching a witness.