Absolutely (as always) but we are talking different countries. Yes, the Madras/Vindaloo/Tindaloo/Phall are all basically the same dish in most bog-standard BIRs; they just adjust the chilli content. However if I am testing a new BIR I nearly always have a Vindaloo the first time, because if it is good and flavoursome they are paying attention to quality and detail. If I then have another completely different dish and it IS different in texture.content/flavour then I know we are on a winner.
I make Madras and Vindaloos for my customers. The dishes are completely different and based on the style and flavours of the region; and they are rarely mind blowingly hot, just very rich in complex flavours. (Sorry I sound laike a farty chef). They are hot but the heat gets to you through all the taste buds not just the tongue.
I guess the other contributers will add to this, but from a UK BIR a Madras is rich in fried tomato, Garlic, and black pepper; Vindaloo is similar but lighter but concentrates on Garlic more and Ginger. I think potatoes appeared because West coast India uses Potatoes a lot, or maybe because Aloo is in Vindaloo. Hmmm....
Happy Cooking
CP
PS Never managed a curry when in Montreal, but had a Chinese (all you can eat) Yuch!