I could be wrong, but the white flower is Mandevilla sanderi, Brazilian Jasmine, and the pink flower is the hybrid Mandevilla x amabilis, 'Bella' series, which is a hybrid of Mandevilla splendens and an unknown parent.

Texas has it's own native Mandevilla macrosiphon. Only 6" tall. Still called Dipladenia by some.

Aren’t the pictures all of the same plant, the white just being an older bloom?

They could be the same plant floral. I just answered with what showed up from searches. I guess he just wanted the cultivar names, which is kind of like asking what cultivar your orange daylily is. Most people are happy just calling them Mandevilla. There are about 190 species of Mandevilla, while Hosta, and Hemerocallis each have only about 20 species. With so many Mandevilla species that can be used or hybridized, and humans doing selective breeding to achieve every color of the rainbow, who can say for sure what is what?

it is a very nice color combination.