Civil suit was in earlier suit is valid in new suit

Hello, I had earlier filed a civil suit regarding land ownership, in which the defendant (same as in my current suit) filed a written statement clearly admitting that I am the owner of the land—but with slightly different boundary details than what I had originally claimed. After receiving the defendant’s written statement, I chose to not press the suit, with the intention of filing a fresh suit reflecting the boundaries as described/admitted by the defendant in their written statement. Now I am filing a new suit for the same land, correcting the boundary descripttion as per the defendant’s earlier admission. My queries are: Can I use the written statement filed by the defendant in the earlier “not pressed” suit as an admission under Section 17–21 of the Indian Evidence Act in this new suit? Since the defendant admitted ownership in the earlier written statement, but is now denying it, can I invoke Section 115 – Doctrine of Estoppel to prevent them from changing their stand? Does the earlier written statement retain evidentiary value, even though the previous suit was withdrawn before trial?