Those would be two of the first things I'd check.
You can get an idea by swapping springs from the mags. Let's call the "good" mag, "A" and the "bad" mag "B."
You can take a swap the springs between A and B. Then run a few through both. If A fails and B begins to work fine, then you know it's the spring. Go grab a + pack from Wolff.
If A continues to work fine but B continues to fail then you know it's something else. Use a caliper to compare the opening on both. Also, check the edges of the mouth and "wings" on B while looking for scratches and gouges running lengthwise down the brass on those first few rounds that get hung up. If B was stamped in such a way that the edges are sharp and/or have burrs, then the extra spring pressure on the first few rounds of a fully loaded mag will make the case dig into and catch on the burrs like teeth. A stronger spring could actually make this problem worse. If that's the problem then just sand and/or radius those edges.
You might also check the stamping on the follower and make sure it's clean with no burrs or hangups. Might also check the inside surfaces of B for debris, burrs, carbon fouling, etc.
And, of course, make sure that the mag is properly cleaned and lubricated. A lot of people forget to lube their mags and it is a good place for all kinds of junk to accumulate.
Peace favor your sword,
Kirk