Do Draconic bloodlines on bloodrager stack with Gold dragon path?

[Captain Garro]

For example, do you get to add together your charges of bloodline breath weapon + mythic breath weapon? Is there any overlap where something becomes redundant? Is the gold dragon bloodline in specific a bad move?

[Conquista]

i don't think they stack, one will just do fire damage or whatever element the bloodline adds and the other holy

[Drake]

Draconic breath of bloodrager doesn't even stack with DD (you get 2 separate ones).