Yes, but you would say "win-win", it cannot be expressed as "double-win". E.g. "This is a win-win situation."

When there are two sides that both win in a situation, we say it is a "win-win situation". If someone is a situation where an action results in two good outcomes for that person, we say "double win". The same person wins twice, in that instance.

Hmmmmmm maybe. But win-win is muchhhhhhhhhh more common and more likely