The difference is the content. Aside from the fact that one was written in Vietnam and one in America, they also both have different complaints.
What's the same though, is that both of these declarations/proclamations of independence start off discussing rights, but end up turning into complaints about things the accused have done wrong, reasons for why they want independence. Which is understandable, because if you're willing to sacrifice lives for it, you must be pretty sick of conditions and the way you are being treated. So you'd probably want to tell someone about it.
If you need any more help with history, or anything really, please message me. Or email me: firstname.lastname@example.org I'd be happy to help you anytime.