The difference feels weird.
(Stats: tiny yarn is Doodles in String Sock, colourway Laocoon, needles are 2.75mm. Giant yarn is Wool and the Gang Crazy Sexy Yarn, colourway is Stonewash Blue, and needles are 12mm. Neither are projects that I need to finish before Christmas, so why am I working on them? Because they’re fluffy, that’s why.)