No. Yakisoba noodles are wheat based-- rice noodles are, obviously, rice- based. Rice noodles are a great substitute for wheat noodles in soups and pastas, but the texture and taste of yakisoba...
They can be. fettucine describes the size of the noodle, where as egg noodles describe the ingredients.
it is made up of eggs and flour.
Most sources say it is best, after drying, to freeze homemade egg noodles, instead of storing in a pantry, due to the raw egg content of the noodles.
They are made by molding dough in the egg noodle shape, and brushing them with egg wash. (egg whites)