Wentzel Christoffel Coetzer Muller - Is this Wentzel Christoffel Coetzer Muller incorrectly linked to two wives?

I believe that this man (with the details of this profile) was not the husband of Elizabeth Catharina Coetzer.
His DN clearly states his children's names, and is signed by presumably his wife (initials JJ) so I think he was the husband of Johanna Jacoba Smit.
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSQN-XWT8?i=1789&a...
There is no mention of a second wife, or children from a second marriage

The DN for what I think is Elizabeth Catharina Coetzer Muller names completely different children
(the current profile for Elizabeth has a date of death of 1879 but no source or document or reference for this, so I believe it may be incorrect?)
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSQ8-66XG?i=1709&a...
This was her marriage record https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSKD-JS41-1?cc=282...

Based on naming conventions, the parents of Elizabeth's husband would have been Stephanus Jacobus and Cornelia Aletta Sophia
Here is a baptism record for WCC Muller born in 1826 to parents with these names
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSV8-7F96?cc=14786...

Here is a 1900 record of the death of WCC Muller at the same farm at which Elizabeth died
https://www.familysearch.org/ark:/61903/3:1:9Q97-Y3Q7-NKG?i=36&...

I would like to continue building out the tree for Elizabeth Catherina Coetzer Muller, but need to make sure that I have the right family details, and do not just want to make changes to the existing tree.
I would appreciate comments and suggestions.