That's a good question. Comparing the Softbank emoji from June 2008 [0] and the initial batch of Apple emoji that shipping in iPhone OS 2.2 (Nov 2008) [1], it doesn't look like there are any missing at all, it's a perfect 1:1 mapping.
Maybe edit rather than omit? Apple changed the people kissing with actual lip contact, the 1910s-looking cancan dancers, and the stink lines on the poop.