1 Tim 3:6 is not saying that the recent convert who becomes puffed will receive the same judgement as the devil. Some translation's got that wrong.
Fall into condemnation ( εἰς κρίμα ἐμπέσῃ )
Κρίμα in N.T. usually means
judgment. The word for
condemnation is κατάκριμα. See especially Romans 5:16, where the two are sharply distinguished. Comp. Matthew 7:2; Acts 24:25; Romans 2:2; Romans 5:18; 1 Corinthians 6:7. However, κρίμα occasionally shades off into the meaning
condemnation, as Romans 3:8; James 3:1. See on
go to law, 1 Corinthians 6:7, and see on 1 Corinthians 11:29. Κρίμα is a Pauline word; but the phrase ἐμπιπτεῖν εἰς κρίμα to
fall into judgment is found only here.
Of the devil ( τοῦ διαβόλου )
See on Matthew 4:1, and see on
Satan, 1 Thessalonians 2:18. Paul uses διάβολος only twice, Ephesians 4:27; Ephesians 6:11. Commonly
Satan. The use of διάβολος as an adjective is peculiar to the Pastorals (see 1 Timothy 3:11; 2 Timothy 3:3; Titus 2:3), and occurs nowhere else in N.T., and not in lxx. The phrase
judgment of the devil probably means the accusing judgment of the devil, and not the judgment passed upon the devil. In Revelation 12:10Satan is called
the accuser of the brethren. In 1 Corinthians 5:5; 1 Timothy 1:20, men are given over to Satan for judgment. In 1 Timothy 3:7the genitive διαβόλου isclearly subjective. In this chapter it appears that a Christian can fall into the
reproach of the devil (comp. Judges 1:9; 2 Peter 2:11), the
snare of the devil (comp. 2 Timothy 2:26), and the
judgment of the devil.
https://www.studylight.org/commentary/1-timothy/3-6.html