Yes, there is a big difference

Sardines are saltwater fish and noodle fish are freshwater fish, and the appearance of the two is also very different.

Sardines are the collective name for certain edible fishes of the genus Sardines, Sardines and Sardines of the family Herringidae, order Herringidae, and some edible fishes of the family Herringidae. Also refers to common herring (Clupea harengus) canned in oil and other small herring or herring-like fish.

Sardines

Noodle fish