Hello, I deal with something like this regularly where the two address layer schemas aren't identical, but they should have the same content so that they are both aligned. If you want to figure out which ones are missing from the other (or not in the correct spot), I use the Select by Location tool where I use one Address layer (usually the one that has more) as the Input Feature with "Intersect" as the relationship, and the other address layer as the Selecting features. Finally I set the check the "Invert Spatial Relationship" on so the results are the ones that don't match. The list will be all missing addresses from the Selecting Feature and some that don't intersect between the two layers but exist in both. Hopefully it's more of the missing ones that you are looking for. I then switch the Attribute table to Show selected records and use highlighting to figure out what's what. To eliminate the ones that exist in both from future results, I manually snap them into the right spot then repeat the tool. Once I have just the ones I need to bring over to the other Address layer, I copy and past the selection into the other layer. I hope this workflow helps with your question.
