Great question. I think there's a number of different things in these motions - but fundamentally SMB is more of a "one to many" motion, whereas enterprise is a more ABM-centric motion.
Given the team structure question here, this means that Solutions Marketing in SMB/Mid-Market thinks about and works with our Demadn Gen team in marketing around campaigns and positioning, content, and offerings, that can appeal broadly to a specific trend, iniative, or vertical. Whereas with Enterprise it applies to a specific company and going deeply into strategy and solutions.
Product Marketing overall should have "brand level" programs that are global and for the entire market, and then tailored initiatives -- in concert with our counterparts in Sales and Marketing of course -- that specifically go deeper.
Obviously, the target personas are different which informs the messaging, positioning, pricing, and packaging strategy.
Hope this helps!