In general there are two types of satellites. Some where you win tickets, and some where you win an entry to a specific target tournament. In the latter case you are directly registered in the target tournament, and of course you can not register twice for the same tournament. So in this situation there is no way, you can win an entry and then also pay to enter later.
You could however win multible entries by playing different satellites, or you could buy in directly while playing a satellite, that is still running, when the target tournament begin. I dont know, how sites handle that situation. I guess, most would then convert your entry to T$. But I would definitely check this in the T&S before putting myself in a situation, where it could potentially happen. So for instance if I am still playing a satellite, when the target tournament begin, then I will not buy in directly.
If a satellite reward tickets, these are usually not for a particular tournament, And this mean, you can use them for any tournament with the correct buyin, and presumably also to reenter such a tournament. But it kind of makes no sense to buy in using money, if you have a ticket, so I dont completely understand the question? It seems to me, that this is only something, that could happen by mistake?
Just pay attention to the limit date to use the ticket. GG