The KJV translators were ordered to retain the "church words" by the king (James I of England), it was part of the translators "royal license". So the KJV has "bishop" and "church" and other church-words while the NASB has evangelical words like "overseer". For example:
[1 Timothy 3:1 NASB] It is a trustworthy statement: if any man aspires to the office of overseer, it is a fine work he desires to do.
[1 Timothy 3:2 NASB] An overseer, then, must be above reproach, the husband of one wife, temperate, prudent, respectable, hospitable, able to teach,
[Titus 1:7 NASB] For the overseer must be above reproach as God's steward, not self-willed, not quick-tempered, not addicted to wine, not pugnacious, not fond of sordid gain,
while the KJV says:
[1 Timothy 3:1 KJV] This is a true saying, If a man desire the office of a bishop, he desireth a good work.
[1 Timothy 3:2 KJV] A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach;
[Titus 1:7 KJV] For a bishop must be blameless, as the steward of God; not selfwilled, not soon angry, not given to wine, no striker, not given to filthy lucre;
[1 Peter 2:25 KJV] For ye were as sheep going astray; but are now returned unto the Shepherd and Bishop of your souls.