I think the title states the question. I am interested sometimes to see what someone has changed from the original. Can I do this easily, or is it “complicated”?
I think you have to edit the “compare” URL manually, but you can put any two notebook IDs in there:
https://observablehq.com/compare/parent_id@version...fork_id@version
You can find the ID (a hex string like 55bed46f68a80641) for each notebook using e.g. @mootari’s notebook here:
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Thanks @bgchen ! It’s been a long time since you and I directly interacted here. In case you didn’t know it, you’re an all time hero of mine!
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@bgchen 
hype train choo choo
definite talk.observablehq.com hall of famer
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and to find out which versions of the original have been published (e.g. to compare to an older version), you can use this notebook:
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You can also choose “Compare fork” for both forks, and then recombine both URLs.
Example:
- Fork B compared to fork A:
https://observablehq.com/compare/e6635c9d5b5ace2a@214...c14b189ca517ee46@234 - Fork A compared to original:
https://observablehq.com/compare/6a419dd0e215f527@41...e6635c9d5b5ace2a@214 -
Fork B compared to original:
https://observablehq.com/compare/6a419dd0e215f527@41...c14b189ca517ee46@234
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For some reason yesterday I kept thinking that @mootari had a notebook which allowed you to input two notebook URLs and get a compare link out, but no matter how hard I searched I just couldn’t find it.
Well, turns out I was remembering a tiny addition in my fork of (@mootari’s notebook that I linked above) (also from 2018!):
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