CCC 999 How? Christ is raised with his own body: “See my hands and my feet, that it is I myself”;1 but he did not return to an earthly life. So, in him, “all of them will rise again with their own bodies which they now bear,” but Christ “will change our lowly body to be like his glorious body,” into a “spiritual body”:2
But someone will ask, “How are the dead raised? With what kind of body do they come?” You foolish man! What you sow does not come to life unless it dies. And what you sow is not the body which is to be, but a bare kernel. .. What is sown is perishable, what is raised is imperishable. .. The dead will be raised imperishable. .. For this perishable nature must put on the imperishable, and this mortal nature must put on immortality.3
1 Lk 24:39.
2 Lateran Council IV (1215): DS 801; Phil 3:21; 2 Cor 15:44.
3 1 Cor 15:35-37,42,52,53.