Hi Larry
Wingham is a separate parish about 6 miles to the East of Canterbury.
Westgate Without, as far as I know, is in Canterbury.*
There's a tower there called the Westgate Tower, so this must give that part of Canterbury it's name.
So I should think Canterbury & Westgate Without could be used as meaning the same birth place, but not Wingham (although in the world of Family History nothing surprises me

)
Betty
*I've just googled it & found a reference to someone born in North Lane, Westgate Without, Canterbury.