If the pins and connectors are similar types you can extract the pins out and re-use them, if they are different you'll need to chop and joint the wires together.
I got 3-4 pin adapters in the box with my amber fans, in a card box at the bottom of the plastic box.
I got 3-4 pin adapters in the box with my amber fans, in a card box at the bottom of the plastic box.