Ok, so some cultural disputes but they both take slaves from raids so there is actua mutual understanding (or at least share the belief) that slavery is normal. Also it leads that vikings have some clans which have more dark elf blood in them (thanks slave midwives) and same that dark elves may have groups which have more northern blood (so sort cross-breeding which can be healthy for elf genetics wise if think about it).<br/><br/>But if there is no raid or wars, I take it the both elves get along in neutral grounds even if wary of each other and otherwise cultures may be different if they do share raiding/slave capture aspects.