Keeping lists in sync

I’m building a fantasy game, where you select a team of 5 players from a pretty long list of available players.

Now, the list of players is shown on the left and can be filtered by name. From that list you can add players to your team.

On the right the list of chosen players is shown.

I can get this to work quite ok with morphing and some hacking with form submissions, but I’m curious as to what best-practice would be here?

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