Ive faced that issue a couple of times. Trying to stain one species to match the other is impossible. Well too hard to deal with. A medium brown color will help cut down on the obvious difference. And darker will help even more. If you dont want to stain. Tell your GC to rip it up and lay the correct wood. Its his stupid mistake and dont let him con you into paying the difference.

I agree with gregmills. I have encountered this also. A professional custom floor finisher can get them close, but just that. You cannot change the basic color of the materials, nor disguise the difference in grain appearance.

Darker may help cover the mistake, but you have to decide if that is acceptable. If you decide to try that...then ask that a side by side sampling be done to get an idea of what the two species might look like after staining...before you agree to that.