Indian curries are varied and complex because each area (and each household) has its own combination of spices and amounts. Curries in China and Japan tend to be less heavy, little to no coconut milk, less complicated in the spice mix, and have a "sweeter" taste. Curry dishes from South East Asia (Thailand, Malaysia, Singapore, Indonesia) tend to be flavored with more herbs, such as ginger, galangal root, lemon grass, Thai basil, etc. This is what you get with the "Panang curry", which while it became a popular Thai restaurant dish, actually was named for the state of Penang in Malaysia.
Curry is truly the "spice of life". The huge variety of flavors, heat, spiciness, texture makes this one of the most complex, flavorful, aromatic, and delicious human invention of all time.
Zz.