They look like siblings to me (same chin, mouth, nose, eyes, skin tone ).
I suspect they've been drawn by the same artist.
Normally I would NOT buy this game, because of it's title. Boy, did I hate these TV-series, full of religious innuendo, daddy Ingalls ALWAYS had a solution for EVERYTHING, and in the end....they lived happily together.
The subtitle of the Twin Peaks series by David Lynch should'nt have been "Who killed Laura Plamer", but "Who killed Laura Ingalls" instead.
BUT............... as far as I've heard, and according to the pics here at the geek, this game could be a mix of Carcassonne and Agricola, two of my alltime favorites.
Definetely will have a look at it in Essen, if it's there!