Yes, that is true but the 2.0L and the 2.4L look almost identical so that's not an easy way to tell them apart.I had a 2011 SX hatchback and that had a 2.4L engine while the EX had a 2.0.
Not sure if 17" wheels were exclusive to the SX. They might have been optional on an EX as well. But if it has 16" wheels then its definitely an EX.Also 17" wheels on the SX.