Thanks for pointing it out to me.
I've found 2006 article (Polish "Lotnictwo z szachownicą" no. 20), which says, that "In Polish literature about aircraft camouflage and markings, Il-10s were presented in a traditional way - top: green, bottom: light blue. This is how our sturmoviks were painted in the majority indeed. But there were found in Poland also aircraft painted in a different way - in a multi color camouflage".
It says next, that part of first series Il-10s had a camouflage typical for Soviet wartime production machines.
As for green shade, there is no closer information, but it was rather darker one on drawings.
Museal aircraft obviously are rather faded (apparently unlike Romanian one
https://x.com/misutanasa/status/1097755644357210115 
).
However, the Czech icon is pretty good.