The terms are used interchangeably here, and seemingly in most other places as well. The biggest takeaway from the spring vs. egg roll debate is that spring rolls are originally from China, but have been Americanized along the way (while egg rolls were always American).
They tend to have a thinner wrapper than egg rolls, and are often also associated with the transparent rice paper rolls you tend to see in Vietnamese and Thai restaurants.
The quote from front of the recipe card for 6-27: Sweet-and-Sour Chicken is as true as anything I could write about this recipe: “Cook chicken legs and thighs the Chinese way, in a sweet-and-sour sauce. This is such a simple way of preparing bargain chicken and the result is just terrific.”
Sweet-and-sour sauce tastes great when you make it fresh, but it’s just as easy to buy the thick, red sauce in a jar and call it good.