Cross-posting and building on a similar answer!
Borrowing from April Dunford, positioning is "context setting for prospects." Once you've established your positioning (which takes time, especially if you're pre-product market fit!), you need to be consistent over a relatively long timeframe, think 3+ years. Positioning answers the value you deliver to your ideal customer, through what differentiated capabilities, and in contrast to what competitors within a particular category.
Messaging operates on a nearer term horizon, and is how you convey your value (whether as a holistic brand or as a product line) to the market; it's the storytelling strategy. Any given campaign or piece of content needs to be laser-focused on a single persona, main point, and genuine proof points or reasons to believe the main point.
To sum up, core product or platform positioning (context setting) is going to be a long-term true-north that informs your messaging (storytelling) for feature launches; if the feature launch messaging isn't rooted in your positioning, it'll undermine the market's ability to understand where you fit in their context. That's not to say you can't be creative with feature launch messaging, of course—often with launch messaging you're able to be more specific/nuanced in terms of your target persona, their jobs to be done, and the competitive alternatives they have to choose from. Just consider closely if you find your messaging feels significantly disjointed from your positioning.