No, but A319s are just about the same size & an operation at 'JB would be marginal.
Also, reflect on the fact that the Government of Guernsey own, & have invested heavily in, AUR & you will not need to be a genius to realise that for them to allow unfettered competition with EZY (even IF EZY were interested in 'JB - which I cannot imagine they are) would be writing AUR's death sentence !
In any event, 'JB is too small for this sort of competition, even on their busiest route.
Also, for The States to pay for a runway extension so as to allow competition from EZY on the 'KK route would be suicidal madness !