Issai and Prolific cannot be used as a pollinizer, as they are female and only produce non-viable pollen. They can set fruit parthenocarpically but are not really self-fertile, just self-fruitful.
Jenny is actually genetically male and does produce viable pollen. It has been described as an “inconstant male”, producing fruit with fewer carpels and smaller size. Jenny does have the Friendly Boy gene that is absolutely required for viable pollen production (and absent in Issai). See the post linked below for the technical paper.
I’m not familiar with Renact/Sweet’n Solo. Here is what I found on Monrovia’s page for Sweet’n Solo.
“This Kiwi cultivar is a product of a planned breeding program under the direction of Jean Renault, at a commercial nursery in Gorron France. The new cultivar was discovered as a seedling in 1995, the result of open pollination of the seed parent variety Actinidia deliciosa ‘Hayward’ unpatented. The pollen parent is unknown. The new variety was observed for several years, and first propagated by semi-hardwood cuttings in 2005, at a commercial nursery in Gorron, France. Subsequent evaluations of the variety have shown the characteristics to be true to type. Sold under the trade name Solissimo® in the U.K., this cultivar was was granted U.S. Plant Patent #23,457 in March, 2013. By comparison, the new cultivar is similar to the commercial variety Actinidia deliciosa ‘Solo’, with the following differences: fruit of RENACT’ produces larger fruit that is significantly less pubescent and nearly cylindrical with blunt ends, as opposed to elliptical in shape.”
USPP23457P3 - Actinidia deliciosa plant named ‘Renact’ - Google Patents