Donation Points are account-wide, however.
Please pay attention to store items, as some are Account-wide and others are not. To show an example..
Not acc-wide
Acc-wide
Most items won't mention this so assume they are only for the character you are making the purchase with. Even though the Transmog sets in the store don't mention this, they should mostly be Account-wide. There's a few faction specific ones that are not.