They are part of the Circumvented Doom Intervention timeline. You know, the fourth branch off of Ocarina of Time where Link waits around for seven years before opening the Temple of Time:
I am a Grownup and therefore an Authority on this matter and definitely Correct and absolutely Not making stuff up.
Also, the first BS Zelda features a made up hero/heroine same as Ancient Stone Tablets. Looks like the same one, aesthetically. It's just that a lot of translations/hacks/reassemblings of BS Zelda include Link as an option or a replacement.
Edited by Mitsukara, 30 December 2017 - 04:37 AM.