1) If the other distro installs its on version of Lilo yes it will; if the other distro uses GRUB (Grand Unified Boot Loader) Lilo will cease to exist, having been replaced by GRUB.
2) Yes and no, most of them I have used shipped with Lilo although some of them preferred GRUB.
3) That depends on if whether the different distro replaces Lilo (most do).
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