There is quite some confusion about the different forms of the Large-billed Crow (Corvus macrorhynchos). 
Depending on which taxonomy you choose to follow, in Thailand there are two forms of the Large-billed Crow:
1. Corvus macrorynchus (Large-billed Crow, in the south), and
2. Corvus levaillantii (Eastern Jungle Crow, in the north and central).

The only crow in Bangkok is the Eastern Jungle Crow.
I guess the birding world is still waiting for further evidence and it seems that there are likely to be future splits.

1st, 2nd & 3rd photo: Lumphinipark, Bangkok, Thailand, 19 January 2013
4th photo: Lumphinipark, Bangkok, Thailand, 12 December 2009