The Org states the following about the so-called "earthly class":
w98 7/1 p. 21 par. 11 "Death Is to Be Brought to Nothing"
While resurrected ones will be the same individuals they were before their death, they will not need to have the same bodies. As with those raised to heaven, God will give them a body just as it pleases him. No doubt their new bodies will be physically sound and reasonably similar to their original body so that they will be recognized by their loved ones.
Consider the following also, which is cross-referenced with Romans 8:11:
(Ephesians 2:4-5) But God, who is rich in mercy, for his great love with which he loved us, 5 made us alive together with the Christ, even when we were dead in trespasses—by undeserved kindness YOU have been saved.