Intersert vs Intervert - What's the difference?

In obsolete transitive terms the difference between intersert and intervert

is that intersert is to put in between other things; to insert while intervert is to turn to another course or use.

(en verb)

(obsolete) To put in between other things; to insert.

* Brerewood

If I may intersert a short speculation, the depth of the sea is determined in Pliny to be fifteen furlongs.

(Webster 1913)

(en verb)

(obsolete) To turn to another course or use.