if its all to do with shock stroke why do betd links make a big difference
also my 2002 sworks has 2 links from factory one for 90mm travel other for 75
your orange is probably the same only with 2 holes instead of 2 link arms
That is a different suspension system all together. The Orange is a single pivot design and has no rocker. I'm sure that on a single pivot design the travel is dictated by shock stroke length. On a multi link or horst link bikes like your Specialized, different rocker lengths change the leverage ratio on the shock to give longer or shorter travel.
I'm not 100% sure on this but in my head the theory all adds up. When i visualise moving the shock mount on that orange i see no difference in travel, just a slackening of the head angle and a slight drop in BB height.