The diff drain bolt and the pan drain bolt are on the same plane, same elevation. SM actually says to use the diff drain bolt, but illustrates the pan bolt. Draining from both results in 4 qts 7 oz.s (though several factors can alter this).
More fluid was drained this way in a shorter time period than from the pan bolt alone over a longer time period. 2+ hours versus 5 hours.
Diff bolt hole ceased trickling and had no further drippage well before 2 hour mark. Pan bolt hole had ceased trickling before 2 hour mark, and only had occasional drip thereafter. Another 3 hours would have netted maybe an ounce.
In the past, with just the pan bolt, trickling lasted longer and drippage thereafter was slightly more frequent.
Both bolts are the same part, but the diff bolt uses a thin washer for its fitting, whereas the pan bolt uses a thick washer for its fitting.
The superceded bolts are longer than the originals. 10 threads versus 6.