I started to write a new question about exactly the same issue, when a link to this thread came up. I've just entered a couple of twins, Ole on 31 March, and Gunder on 2 April in 1798. This pastor was extremely conscientious, and I have no doubts that it must be correct. The entry is on this page, first column on Easter Day (Fer. 1 Pasch.), Nos. 47 and 48.
The first one, Ole, grew up, but Gunder only survived for 19 days, possibly as a consequence of the delayed birth. And luckily, their mother survived, too.
I get a warning when I save, but of course click "Save anyway" to proceed. Is there any risk that somebody would find this suspicious and "correct" one of the birth dates? I've added this sentence in the biographies of both: "He was a twin, and the two brothers were born two days apart from each other." I hope that is sufficient.