Mark 15:46 καὶ ἀγοράσας σινδόνα καθελὼν αὐτὸν ἐνείλησεν τῇ σινδόνι καὶ ἔθηκεν αὐτὸν ἐν μνήματι / μνημείῳ ὃ ἦν λελατομημένον ἐκ πέτρας καὶ προσεκύλισεν λίθον ἐπὶ τὴν θύραν τοῦ μνημείου.
He bought a linen cloth, and taking him down, wound him in the linen cloth, and laid him in a tomb which had been cut out of a rock. He rolled a stone against the door of the tomb.
Noun: Dative Singular Feminine

Luke 23:53 καὶ καθελὼν ἐνετύλιξεν αὐτὸ σινδόνι καὶ ἔθηκεν αὐτὸν ἐν μνήματι λαξευτῷ οὗ οὐκ ἦν οὐδεὶς οὔπω κείμενος.
He took it down, and wrapped it in a linen cloth, and laid him in a tomb that was cut in stone, where no one had ever been laid.
Noun: Dative Singular Feminine