This is meant to be a quick written guide for Medieval Dynasty users (and tbh mostly me when I replay this game). The quest "Neighbours Have Their Differences" is activated in Skauki (Oxbow Map) and the quest giver is a NPC called "Wojciech".

Before answering you probably have to give their houses a quick visit, first Wojciech's house, then Nasiebor's house. Then you can talk to Wojciech and say the following:

Numbers with dots mark conversation progression and numbers with parenthesis mark which conversation option you should take.

1. He tried to prove that there are some differences between your houses. And well... there are some.
2. (2) He's got a deer skull, and you've got a moose skull.
3. (3) He's got dandelions, and you've got daisies.
4. (4) The rugs on the floor are the same.
5. (4) The candles are placed in the same way.
6. (3) There's also a rug on a wall. You've got badger fur, and he's got wolf fur above the fire.
7. (4) You've got a dove relief over the door, and he's got a squirrel relief.
8. He believes so.
9. I'll talk to him again then.

That's it. You have to talk with Nasiebor after that and complete the quest. This was my first guide, so be nice :D