The BFFness is way more explicitly acknowledged in the comics ever since that time when Bucky tried to kill Tony Stark and then Sam ended up babysitting him for a few months. GOOD TIMES. IIRC at Sam's canon point Bucky is either leading the Thunderbolts or in space, but they've seen each other pretty recently.
I'm super looking forward to confusing Thor though because Sam's Avengers team has Lady Thor on it!
I seem to recall Sam being her own sidekick in 65 too lol.