I have a large postcode dataset of ~1.6 million observations in Layer A.
I have a smaller dataset of ~5000 observations in Layer B.
Layer A contains an ID that matches postcodes with observations in Layer B.
I want to find the distance between every observation in Layer A, and the associated observation in Layer B, using the common ID field.
Note, I do not want to do Nearest Neighbor Analysis, there is a specific network structure.