If you "come with" somebody, it can mean that you brought them, or that they brought you.
"Come along with" means that you went with someone who was already going. See also 'tag along'.
In your examples which are posed as questions, it is possible they could mean the same thing - the context would determine that. However, the first could be an invitation from two people invited to the same party to just travel together, whereas the second sounds more like the first person is inviting someone else to come to the party.