You can't. 3842 can be replaced by 3862, 3862 cannot be replaced by 3842.
The 4 feet of 3862 are empty feet, and 3842--4 feet are concussions. It's okay to make some changes. According to the requirements of 3842, the chip is welded in place, and the 4-8 pins are connected to a 10K and 1000P ground, and the other pins do not need to move.