The dashboard shows global distribution, and I wonder if there's a way to find out the difference in Gingerbread distribution between say, India and Europe.
Not for those "ancient versions", but for Android 4.0+ you can find some stats in Christina's Blog. Giving the example matching closest to your question:
I answered a similar question some time ago. The best source I could find was this site, which bases its statistics on Internet traffic generated on the domain
.mobi, managed by the domain registry Afilias, by mobile devices. The site gives access to statistics on the web usage by different OS versions (not only Android) by country. With the free access it is possible to select the country to look up, but with paid plans there are a lot of filters available to refine the queries. The process of comparing data can be lengthy, though, as you must look up country by country, there is no general overview.
Also note that: the statistics cannot be precise, as they are bounded to accesses on that particular domain name, but I think they can serve well for an overview.
This statistic I found from statista.com where you wil find different distribution of Android operating systems used by Android phone owners in October 2015.