Only if you've got fat32 on the drive ... or if the boot disk you made can read ntfs drives. ntldr is part of the boot loader, so you'll most likely need a way to copy/extract that from the installation cd to either put it back, or overwrite a corrupted file.
The setup disks that came with NT/2k only got you booted, and started on setup. You could do the same by booting from the cd-rom, but since older computers couldn't do that for the most part, they included the disks, just in case.
A boot disk is made to get you to a command prompt for troubleshooting. Possible cd-rom access (if it's set up that way), and other diagnostic tools if you want 'em. That's basically the only difference between the two. One's for troubleshooting, and one's (or three) is to get you started on the setup process.
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