1. They are talking about what they want to be in the future.
2. They are talking about their future job.
(Are bothe the same in meaning? Do we have to use 'job' or 'jobs'?)
They are both the same.
Yes, use jobs in the second sentence.
2. They are talking about their future job.
(Are bothe the same in meaning? Do we have to use 'job' or 'jobs'?)
Yes, use jobs in the second sentence.