Margareta Gerrits, SM/PROG - Two wives are one person?

Neither Richard Ball http://www.ballfamilyrecords.co.uk/olivier/I112.html, nor the FFYP http://www.e-family.co.za/ffy/g5/p5295.htm thinks
Geertje Aeltje Gerritz, SM/PROG and Geertje Aeltje Gerritz, SM/PROG were two different people.

What is the evidence that suggests that that Jan Coenraadsz Visser, SV/PROG married two sisters?

"In the Commander’s diary, 18 December 1662 are mentioned ‘the wife and 5
small children’ of Jan Coenraadsz Visser. In the muster roll of 1664, the
earliest to list numbers of children, we find Jan Coenraet Visser, of Ommen,
and Geertje Gerrits of Hardenburg listed with 3 children. Since the daughter,
Maria Jansz Visser was already married by the time of that muster roll (we
do not know its exact date, but she appears with her husband at that muster),
the three children mentioned would presumably have been Gerrit Jansz,
Geesje and Coenraad. If there were originally five children it would seem
that by 1664 two of them had died, but the number of children given may
simply have been a mistake. At all events we know of only three children born
other than at the Cape who must, therefore, have accompanied Geertje Gerrits
from Vlie to the Cape.

Interestingly enough, in the muster rolls from 1662 to 1665 she is named as
Geertjen Gerrits, but from the baptism of Zacharia, Aug 1665, she is known, in
the church registers and the muster rolls as Grietje Gerrits. I would have thought
that Geertjen and Grietje were two different names, but the muster roll of 1665
lists the couple with four children, which must mean it has overlapped the birth of
Zacharia at whose baptism entry she appears as Grietje. Presumably, then we
are talking about the same person all through from 1662 until 1692 when she died."http://www.ballfamilyrecords.co.uk/olivier/I112.html

Private User & Private User is there a reason not to merge them?

Earlier Discussion here: https://www.geni.com/discussions/142618