What is the even FROM? First of all, "bottleneck calculators" are complete horsecrap. Secondly, a bottleneck calculation literally has nothing to do with what was asked regarding whether you'd ACTUALLY looked at benchmarks comparing the 1660S and 3060. I assure you, the idea that they are even remotely comparable is completely laughable and entirely inaccurate.
Really it depends a lot on what resolution you are targeting, but since your above screenshot seems to suggest 1080p I'll just say this. There are SIGNIFICANT differences in performance between the 1660 Super and 3060 depending on the game and resolution.
For example. At 1080p. For Hitman, there's a 54fps difference.
https://www.guru3d.com/articles_pages/galax_geforce_rtx_3060_ex_white_12g_review,10.html
Assassins creed? A 24fps difference.
https://www.guru3d.com/articles-pages/galax-geforce-rtx-3060-ex-white-12g-review,11.html
Shadow of the tomb raider? 44fps difference.
https://www.guru3d.com/articles-pages/galax-geforce-rtx-3060-ex-white-12g-review,12.html
Formula 1? 60fps difference.
https://www.guru3d.com/articles-pages/galax-geforce-rtx-3060-ex-white-12g-review,13.html
Witcher III? 40fps difference.
https://www.guru3d.com/articles-pages/galax-geforce-rtx-3060-ex-white-12g-review,14.html
And so on. Those are not insignificant differences, however if you are only trying to hit 60fps they might be differences that don't really matter that much to you because for the most part both cards can handle that. If you are looking for the higher end of settings or higher FPS though, it's going to matter.