I hate chicken tikka masala myself, but when I am cooking it I know I when have got it right because it tastes of tomato soup. Cream, sugar, tomato paste, salt - it's not surprising really. I have never seen evidence of soup being added in restaurant kitchens, but a lot of chefs use tomato ketchup. It's only human to seek out cheap short-cuts I suppose.
Other tinned goods I have seen used frequently are mushrooms, potatoes and spinach. Frozen cauliflower is also used - I have seen it being dumped straight from the freezer into the deep fryer, and it looked surprisingly OK.
We have occasionally used tinned browned onions to speed up gravy making. I can't detect any difference in the finished product.