不相上下
On a par with.
Much of a muchness.
Break even.
As well be hanged for a sheep as for a lamb.
A dead heat.
On a dead level with.

eg：The way John seeks to solve the question is on a par with mine.

同义词：半斤八两 Six of one and half a dozen of the other.
反义词：相去十万八千里 Poles apart.