If you’re in Europe, there’s the exhibition on this topic at the Gallo-Roman Museum in Tongeren, Belgium for a few more months, after previous stops at, among other places, the Met:
At least in some cases, they have the side-by-side comparisons you’re looking for (although they obviously don’t have originals of the most famous statues).
A beautiful page on a prior exhibition, with images that allow you to switch between the reconstruction and the “white” look the statues have now after millennia or decay:
I would love to visit a museum that has original ancient sculptures side by side with reproductions of how they looked originally.
If you’re in Europe, there’s the exhibition on this topic at the Gallo-Roman Museum in Tongeren, Belgium for a few more months, after previous stops at, among other places, the Met:
https://galloromeinsmuseum.be/en/see-and-do/antiquity-in-colour/
At least in some cases, they have the side-by-side comparisons you’re looking for (although they obviously don’t have originals of the most famous statues).
Video with more info:
https://www.youtube.com/watch?v=ULQvS-iKNcQ
A beautiful page on a prior exhibition, with images that allow you to switch between the reconstruction and the “white” look the statues have now after millennia or decay:
https://buntegoetter.liebieghaus.de/en/
In case you need an overview of future exhibitions:
https://www.polychromyroundtable.com/exhibitions.php
Not that the above page got the dates for the exhibition in Belgium wrong, stating that it’s until July, whereas it’s actually until June this year.
Here is an alternative Piped link(s):
https://www.piped.video/watch?v=ULQvS-iKNcQ
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I’m open-source; check me out at GitHub.