I would say definitely Yes.
Some here often think of GPU design as architecture, or some such high level framework. The truth is that while architecture is very important, gains at the lowest level are often critical. Circuitry, transistor tweaking, power control and numerous others. As an example, Nvidia can operate at lower voltages than AMD. This probably has little to do with the macro design layout, but the very low level details.
AMD CPU engineers will have gained a lot of knowledge in designing Zen and this low level expertise is directly applicable to the GPU division. This can work both ways as a few years ago, the GPU division enabled the CPU division to reduce the traditional size of the metal layers in the APU allowing a large increase in density.