Languages do not exist as unconnected entities; rather, every language will be related in some way to every other language…
Systems of measurement might not sound like the most interesting of things, but they can be used to good effect in a role play campaign. There are three main ways I can think of: 1) Adding colour; 2) Culture shock and 3) Archaic systems.
In a small farming community, the only way to cross a river is to basically pole vault across. A small section of river has a small raft on a string to pull items across but for a person to cross they must use one of the many provided poles. Might be interesting seeing what the players do when they come across it. Villagers do it all the time so are skilled and can do it with ease.