There's a slight difference.Yes, I saw that before, and I did try to show her that on my smartphone, but she insisted on looking stuff up for herself so that she said she could find the latest info. If she's right, then why doesn't CIC/IRCC just plainly say that the requirements are the same as for a passport? God save me from nasty politicians, dense bureaucrats, and stubborn shop clerks, hehe.
The passport one requires a Guarantor to sign and the Citizenship one requires to write down the name of the applicant.
Other than that the size is the same so people shouldn't worry too much as long as the size is correct and the information on the back is filled properly.