To tweak a spell or ability, is it balanced to swap damage types?

@SethdeReus @mikemearlsto tweak a spell or ability, is it balanced to swap dam types – eg burning hands to cold/acid/psychic/raidant? Changing a spell’s damage type won’t unbalance it, but doing so changes how the spell affects certain targets.

— Jeremy Crawford (@JeremyECrawford) September 24, 2014