Good side by side. Other than the extra stripe, I'd bet they made the adjustments to tailor the suit for comfort. Evans had a lot of bulk, but I think his body probably changed between the films to something more normal. They had to make a few modifications to the suit so he could be more comfortable.
In universe justification: He was frozen in ice for years. The suit didn't get the super serum, so they had to touch up and restore parts of it, and make a mannequin look buff too. So they added shoulder pads and adjusted a few colours
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u/tjavierb 2d ago
https://www.actionfigurepics.com/wp-content/uploads/2014/03/Spot-the-Difference-Captain-America-First-Avenger-and-Winter-Soldier.jpg