Designing for IOS and Android

I am not sure if this is the right stackexchange site to ask this question. The company that I work for gives us only IOS designs (buildt totally using IOS components. No material design whatsoever). And they expect the android developers to use the same design for android. Android developers find it very difficult.

As far as my opinion is concerned IOS and Android both follow different design philosophies; one follows flat and the other material. I think it is utterly foolish to ask an android developer to develop using IOS designs and vice-versa.
I would like to have opinions of designers? Am I right in thinking that there should strictly be a design for each platform? Or is it normal to start developing on android using screens designed for ios?