Dear Massimo,
as you suspect the information is for the following airplane:
The inscriptions are "За Гальченко!" with a large "З" superimposed to "Горьковскому пожарному", so it a plane donated by firefighters, and with a dedication, an eagle and a couple of stars.
About the “silver” plane, it comes from M.Yu. Bykov, who says it is in a factory applied gloss white, as was in use in winter 42/43, unit unknown.
What appears as a white stripe on the rudder is said to be a light effect.
About the heart, it is presumed yellow / orange, the arrow black, the trimmer either black or minium.
Dmitry Novikov thinks instead that it is silver, with pale red spinner, star and tail number, with a green heart and black or dark red arrow.
Well, who knows, but these are really colorful planes!
Regards
Daniele