It's more about form than flavour. Two different raviolis can have totally different stuffings, but no reasonable person will confuse a lasagna for a ravioli... although I suppose you could put a ravioli layer inside a lasagna...
Flip out of the metaphor and into literal pasta dishes and I like where you're going with this
It would take an intrepid determined cook to produce the culinary metaphor of what a modern microservice landscape looks like: a bucket of ravioli that are connected to each other by a web of spaghetti. (Does that sound like more pasta than filling? Yes, it does.)