Engineering Physics Assistantship when I applied to Mechnical Engineering

[cnilsen]

I applied to and have been recommended admission for a top 20 engineering school in Mechanical Engineering. I focused my application on engine combustion research as that is what I am interested in pursuing. Today I received an email from a professor in Engineering Physics saying that he is interested in hiring one or two grad students this year and that he would like to talk to me. His research is on composites and vibrations. I have experience working with composites but it was only briefly mentioned in my application. What does this mean? Should I talk to him about working with him? Will that hurt my chances of doing research in the field that I am more interested in? Thank you for your help.