Theming Standardized Ancestry Feats
When applying these feats to an existing ancestry that allows them, you should consider how they operate, both mentally and physically. For example, a brenneri PC who takes Swimming Specialist might do so via a natural skill and through the use of their forelimbs, while a g'folian PC who takes the same feat might do so by using their legs to propel and maneuver underwater. A goblin with Overcrowd might have a different approach to moving in tight environments as an ysoki with the same feat. In any case, always consider the expression you want to use to represent how your character achieves the mechanical result of the feat.
Some ancestry feats might have less obvious definitions. Ancestral Cantrip and Ancestral Magic manifest differently, with some species having innate psychic powers to represent occult spells. Conversely, a madrosarai might have magical abilities that stem from the powers within their blood.
When determining how different ancestry feats might function, it's important to confer with your GM and determine if these choices have an in-game effect. Unless you both agree, these should be cosmetic choices that have no additional mechanical effect beyond what is listed in the feat.