The 319 does have greater range than the 320, provided engine power is sufficient. The 319s have 22k engines and the 320s, 27k engines, but the 320 APS weight is only about 1 1/2 tonnes more than the 319.
Thus it is an airfield performance problem that prevents the 319s going to the Canaries, the Greek islands, Cyprus and Egypt, at least if you don't want to make it a 4 sector day!!