Difference in 6n and 6m on Dream

[purplemusik]

Right now my mom and I have cabins next to each other on the dream, deluxe oceanview. The price just dropped and we called and they said the one with 5 people in it we can get the discount but the 6L room we have for the 4 people could only get the discount if we moved 20 rooms down from each other (saving $230!!) to a 6m. I don't understand why we'd have to swap rooms but even so...what's the difference in rooms? I can't find it online. Would you guys do it?