Same with higher end restaurants in the US for Chinese and Indian food.
Depending on where you are the cheaper restaurants in immigrant communities will be similar.
You get the regional food the chef's mother made. Occasionally, there are local substitutions (different mangos, peppers, meat cuts).
Higher end chinese or indian restaurants are pretty rare in the US. Both cuisines have been relegated to the fast, cheap delivery/takeout space and places doing higher-end (and higher priced) dishes find it difficult to get customers.
You get the regional food the chef's mother made. Occasionally, there are local substitutions (different mangos, peppers, meat cuts).