When you opened this page, the Systems Thinking page went away. Click on the title in the previous sentence to bring it back. Its top should look like this:
The new page
Now click on the older twin's flag (on the new page, not in the picture above). You should see this page and two versions of Systems Thinking. The second will look like this:
The remote page
Two things to notice:
* The new page has a blue border, indicating it's from another (not origin) wiki. That's because you earlier changed the origin to be the green-flagged wiki.
* That blue page refers to its twin as "newer."
Both pages agree: the one on the origin wiki is newer. That's because I edited it after "forking" it. (If I hadn't, both pages would note that the other twin was "same" rather than "older" or "newer")
You can compare the versions. When people fork versions it's hardly ever to make just small changes, nor would you probably be interested in small corrections. What you should expect is to see that the newer page makes a substantial revision to the original. Paragraphs will have been added, deleted, moved, or rewritten.
Try clicking on one of the two pages to move the focus there (if it's not already there). Then hover over the first paragraph and press the Shift key. You'll see something like this:
Comparing paragraphs
The highlighted paragraphs were originally the same. The wiki knew that even though I changed every word in the newer version.
Continuing to hold Shift, move down to the next paragraph. (Or let off the Shift key, move, and press Shift again.). You should see this:
Are these the same?
Are they the same? It's visually obvious that the changes, if any, will be trivial because the length of the paragraph hasn't changed. So who cares what the specific changes (if any) are?
Continue to scroll around. Notice that the pages try to put the "same" paragraph side by side. See if you can tell which of the older paragraphs have been deleted or moved.