Even though they are allies I don't see them sharing much knowledge with each other, for example, the asura are so proud they'd keep all their golemance spells and would never work with the charr to create new things, even if it would be of benefit to them, due to considering charr inferior.
On the contrary, charr WOULD work with the asura because of their "means to an end" belief, but would end up getting tired of them and causing disputes.