apt-install 和目标内的 apt-get install 有什么区别？

Question

这ubuntu 帮助预置链接到示例文件其中包含以下内容：

# This command is run just before the install finishes, but when there is
# still a usable /target directory. You can chroot to /target and use it
# directly, or use the apt-install and in-target commands to easily install
# packages and run commands in the target system.
#d-i preseed/late_command string apt-install zsh; in-target chsh -s /bin/zsh

apt-install zsh使用和之间有区别吗in-target apt-get install zsh？