Racedo, loadfactor is loadfactor. It is independant of plane type. It is the percentage of offered seats sold. It is a raw number and any comments about yield and other derivatives is pure speculation.
Furthermore, the ezy specification is 156/180 seats. However, that is still completely irrelevant to loadfactor as LF is still a percentage. You get less passengers moved with 90% LF on a A319 than on a A320, but that is, again, besides the point. Operating costs differ between the two, naturally.
No disagreement but a 90% load factor on a A320 v A319 means flogging another 22 seats on a flight.
An all A320 fleet would require a 12% increase in tickets sold to maintain same load factor.