Is soy sauce and fish sauce a suspension?

It depends on where you shop, if they have it, and what the different prices are. If you bring a calculator along with you on shopping trips, you can compare prices of different items, and what the...

No, those are two names for the same thing.

No. They may look the same, but wocesteshire and soy sauce are two completely different flavours. However, if you like the taste of one more than the other though, by all means use soy sauce.

dark is more sweet but soy has a bit more spice

Many cultures have a version of fish sauce, but the main ingredient is generally fermented fish.