yeah, most of them have the same patterns and changes. often 1 - 4 - 5, and probably either a 2 - 5 - 1, a 6 - 2 - 5 - 1, or a 3 - 6 - 2 - 5 - 1 turnaround at the end. those are basic building blocks. Now most organists/keyboardists will add other changes and chord movements to give it flavor (not every musician wants to play the hymns as is and basic - they do tend to be kinda drab). But if you get used to their style (and each one will play it differently) u can wade through those movements and pick out the basic changes.
