No. A guaranteed minimum income means that you can make 500 Euros scrubbing toilets, and welfare bureaucracy will top that up to 1000 Euros after "means testing".
A UBI means that you get 1000 Euros from the government without bureaucracy. If you so wish, you can earn additional income by scrubbing toilets.
> No one wants to give rich people more money, not even those who conceived of the plan.
There's nothing wrong with giving the rich 1000 Euros like everyone else, as long as tax rates are adjusted so that they effectively give the 1000 Euros back. This zero-sum effect may seem silly, but it's a simple implementation without any additional bureaucracy.
My point was that, even if there were a magic source of free money for the UBI, "don't give money to the rich" would still be implemented in the most simple way as "do give money to the rich, then get it back".
The universal in UBI is key, it means everyone gets the same basic amount, no matter how rich (reframing on purpose to make a point). No one wants to give rich people more money, not even those who conceived of the plan.
When people start talking about UBI, they are really talking about a guaranteed minimum income. And that's effectively welfare, which we already have. So it becomes mainly a discussion about reducing barriers to access welfare.