Great looking battle and insane miniature collection!
As to battlefield.
I was near Kije (today Kay) and Sulechów only by transit (and never knew about the battle - as I am not fan of XVIII century warfare unfortunately)
But terrain in Poland tend to be heavily changed since XVIII century. So if I were you I would trust Prussian map a little more than Google.
I am using Google to recreate some of the WWII battlefields though and I love that tool (unfortunately Germany is blocking it on their territory
But further back than XX century one is finding surprises
As an example look at map of my homecity Sochaczew- a Venice of the north in 1798 as it apper!
and look at the same place in google maps
So wile looking at XVIII century battlefields I trust maps more than google
Especially Prussian maps - Rusian ones can be more dodgy
In 2009 (250 anniversary) there was a conference on the battle itself in nearby Sulechów and what i can see one of the speakers was talking about modernization of local area after the war but I am unable to track conference publication so I cannot help you in any substantial way.