Summary: Yes, it is an individual work with a heavenly reward proportionate to faithful zeal.
Discussion: 1 Corinthians 15:40-42 (NKJV), 40 “There are also celestial bodies and terrestrial bodies; but the glory of the celestial is one, and the glory of the terrestrial is another. 41 There is one glory of the sun, another glory of the moon, and another glory of the stars; for one star differs from another star in glory. 42 So also is the resurrection of the dead…”
We know there are different positions and levels in heaven. Michael is called an archangel (Jude 1:9) or chief angel. Before he fell, Lucifer was called the Morning Star. Isaiah 14:12 (NIV), “How you have fallen from heaven, morning star, son of the dawn!
Now consider Christians, the new creatures in Christ, who receive a heavenly resurrection in glory. Revelation 14:1 (NIV), “Then I looked, and there before me was the Lamb, standing on Mount Zion, and with him 144,000 who had his name and his Father’s name written on their foreheads (they develop the mind of Christ).” These are the saints, the Bride of Christ (Revelation 19:7-8) elevated with Jesus.
They are described again in Revelation 17:14 (NKJV), 14 “…He (Jesus) is Lord of lords and King of kings; and those who are with Him are called, chosen, and faithful.”
The saints receive this heavenly position of glory (Revelation 1:5-6) because they were faithful. Romans 2:6-7 (NKJV), “who will render to each one (each individual) according to his deeds: eternal life to those who by patient continuance in doing good seek for glory, honor, and immortality”. The saints joyfully used their opportunities to serve God and to develop Christ-like characters. They are “more than conquerors” (Romans 8:37) over the world, the flesh, and the devil.
Revelation 7:9, 14-15 (NKJV), 9 “After these things I looked, and behold, a great multitude … before the throne and before the Lamb, clothed with white robes, with palm branches in their hands,…14 ‘These … come out of the great tribulation, and washed their robes and made them white in the blood of the Lamb. 15 Therefore they are before the throne of God, and serve Him day and night in His temple…’”
These verses symbolize other individual Christians who receive a lesser heavenly resurrection. Why? Because they need hard experiences to wash themselves of the love of the world, self, and sinful things. They are not more than conquerors, but they are conquerors.
Thus, 1 Corinthians 15:41 explains that our heavenly resurrection reward is dependent on each individual Christian’s faithfulness and the development of the mind of Christ.