[次第「じだい」]だ => It depends on A N2
Based, Focused, Depending on
[次第「じだい」]では => Depending on A, B may change N2
Based, Focused, Depending on
には[及「およ」]ばない => There is no need to A N1
Need/Requirements
には[及「およ」]ばない => There is no need to A, Doesn't reach the level/ability A; can't compete with A N1
Comparison/ Exchange