The Tale of Jacob and Josephina

Interesting story:

This touching scene in Roermond, Netherlands, reveals two final resting places nestled within separate cemeteries. The reason? Jacob Werners Constantinus van Gorcum, the husband, was a Protestant, while Lady Josephina Carolina Petronella Hubertina van Aefferden, his beloved wife, was a devout Catholic. Their differing faiths meant they could not be interred side by side in a single graveyard. 

They married in 1842.

When Jacob passed away in 1880, his resting place was designated against the wall. Eight years later, as Josephina breathed her last, her final wish was not to join her family's tomb but to be laid to rest against the same wall as her cherished spouse. Their custom headstones stand as a testament to their enduring bond.

Wonderful. Since anyone could change religion in nineteenth-century Netherlands, I wonder why neither one of them converted to the other's faith? I first supposed that there must have been strong family, inheritance, or professional issues, but then I thought it is possible they may just have been committed to their own churches. None of the online sources about them says.