Kind of contradictory... it’s smaller, therefor has less filter and as such - less surface area. That’s the only mechanism for increased pressure from a smaller filter if the level of filtration is the same.
Oil pressure is also pointless if it’s at the expense of flow IMO. Does anyone know exactly where the pressure measurement is taken from? Pre or post filter?
To my knowledge there’s never been any complaints about oil pressure on the k20. If it ain’t broke don’t fix it until it is.