Bring your behaviours into your answers. The relationships you've built, the challenging people you've persuaded etc. It's important to be clear on the activity and the task, but ensure, within the STAR framework, you're not only answering the "what" you did but the "how" you did it.
As an interviewer the "how" means more to me, as it's a signal not only to your ability to succeed in the role but your ability to be the best you can be within the culture of the organisation.
I suppose that answer varies for everyone. For me, it was simply about being more comfortable with marketing than with product management. I didn’t really know what product marketing was until a few years into my marketing career but once I got into it, I loved it. In hindsight, I don't regret it for a second. Having said that, there is obviously an overlap and each position must intimately understand the other.
I think it depends ultimately on what the team needs. In a highly technical area, I'd value industry and product knowledge highly, as long as the person is then coachable and open to learn on other areas within the PMM world. In a not so technical area, I'd prioritize PMM skillsets over other areas. Soft skills should be part of the package either way, aligned with the value of your team and company.
Ultimately the goal is to find the right balance and bring different perspectives so the team can learn from each other as well.
Having a culture of openness and transparency across the team. Strong support in the development and alignment with each individual PMMs career & skill development roadmap. Finally, you offer interesting and stretching projectsthat spike passions and, as a manager, give your team the guardrails to operate and then, get out of their way!
I tend to keep my communications short, sweet, and to the point while keeping the mentality of "what's in it for them" at the top of my mind. Bullet points and a TL;DR summary help with this. Make sure there is a crisp ask or offering at the end if you are hoping for a next step And as you would with anybody you work with, be respectful of their time!