Ramen is Japanese noodles not Chinese noodles. Ramen is thicker and Chinese Min is thinner. Basic noodle making ingredients are probably similar but each culture has their own variations, for instance the Japanese also use buckwheat and spinach in their noodles.
Ramen soup and Chinese soup are made from different ingredients, one traditionally uses fish stock, the other uses pork. The toppings are typically different in types of vegetables and cut. All in all, they're different if you know the difference. If not, you're right, they're both spaghetti in salty water.
60 years experience with noodles