Hi & welcome! Agree with the suggested ID's. I find the cane type Begonias to be very un-thirsty plants during winter, just like Hoyas, both have similar tolerances for light. Unless you would make some attempt to moisten the soil of a Hoya less a Begonia when watering, there's no reason they shouldn't enjoy being companions. More thirsty plants use the moisture quickly, less thirsty plants seem to appreciate the more thirsty plants helping to dry soil quickly. Soon, I will put cuttings of Coleus in many of my potted house plants to save inside for winter. They're like the canary in the coal mine; when Coleus wilts, the pot is definitely dry. To add a bit of perspective on how I like to group plants together, I have a lot pots that are similar to this:
