I labelled various genera/point-groupings.
For each species an x,y pair is created with the x - the sequence number of the taxon in the earlier world bird checklist (labelled “z19n”); the y value is the sequence number in later version 10.2 (“i20n”).
Obviously if no changes in sequence occurred the points would lie along the diagonal identity line.
Each genus has a single color – the colors are assigned by an algorithm in the plotting routine and there are so many genera that the color list is cycled through multiple times. Each genus has a single color, but the colors are not unique to a particular genus.
I labelled various genera/point-groupings.
Points, or clusters of points that moved earlier in the sequence are below the identity line, those that moved later in sequence are above.
If a genus cluster maintains largely the same within-genus sequence but is moved within the Trochilidae, it will be a diagonal group of points parallel to the identity line but moved above or below it. In this group this is a common pattern. An example is Heliangelus.
In contrast the genus Phaethornis has changed mostly by reordering the species sequence.
In contrast, this similar plot shows the change across 9 years (2009-2018) for the generally accepted sequence of Tyrannidae.
In this case the only substantial change was moving Calyptura cristata from the Cotingidae to the Tyrranidae.
We can, I believe, expect extensive revisions soon in this group.
A more interesting comparison is with the recent and substantial revision of the Thraupidae.
This plot shows the sequence change between IOC 10.1 and IOC 10.2.
Comments & Suggestions to Data Steward 
: