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This IS sunburn! Unfortunately, sunscald can only be cured by providing shade. This is recommended after pollination.

Here are a couple of articles that will offer some suggestions on lessening the effects of sunscald:

https://www.gardeningknowhow.com/edible/fruits/raspberry/white-drupelet-syndrome.htm

https://www.gardeningknowhow.com/plant-problems/environmental/sunscald-on-plants.htm

This collection of articles will help you with the care of Raspberries:

https://www.gardeningknowhow.com/edible/fruits/raspberry

Yes, you can grow raspberry plants near boysenberry plants. Both raspberries (Rubus idaeus) and boysenberries (Rubus ursinus x idaeus) belong to the Rubus genus and are compatible for planting in proximity. Ensure proper spacing to allow for air circulation, sunlight, and easy access for maintenance. These berry plants share similar cultivation requirements, including well-drained soil, adequate sunlight, and regular watering. However, it's essential to monitor for any signs of disease or pests and address them promptly to promote the health and productivity of both raspberry and boysenberry plants. They will be susceptible to many of the same issues.

https://www.gardeningknowhow.com/edible/fruits/boysenberries/boysenberry-plant-info.htm

https://www.gardeningknowhow.com/edible/fruits/raspberry/care-of-raspberry-plants.htm

https://www.gardeningknowhow.com/gardening-pros-cons/pros-and-cons-of-companion-planting

Ruby Beauty is considered a summer bearing raspberry. Here is how to prune those:

https://www.gardeningknowhow.com/edible/fruits/raspberry/prune-summer-raspberry-bushes.htm

https://www.gardeningknowhow.com/edible/fruits/raspberry/pruning-raspberry-bushes.htm

https://hortnews.extension.iastate.edu/2011/2-9/raspberries.html

Likely red. They will go from a lighter color, like that, to red. From here is just patience, and then you can enjoy your raspberries after they ripen!

https://www.gardeningknowhow.com/edible/fruits/raspberry/care-of-raspberry-plants.htm

https://www.gardeningknowhow.com/edible/fruits/raspberry/how-to-harvest-raspberries.htm

That would be scale, and they can be very difficult to get rid of. They seal themselves to plants, which makes treating them very difficult. They cause bad infections and disease once they get established. There are natural treatments like neem oil, or its active compound azadirachtin, or you can choose chemical means. Just make sure that it is labeled for scale, since many chemicals will fail to treat them. Before you treat, you will want to remove all that you can by hand. Then you can treat what you cannot reach. You will want to keep treating until all are gone, or they will come back just as bad.

https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm

This looks to be crown gall, unfortunately. The plant needs to be destroyed and all remains removed from the area. This will be permanent as long as the plant is there. Eventually the plant will die, anyway.

https://www.gardeningknowhow.com/plant-problems/disease/how-to-fix-crown-gall.htm

You can visit your nearest horticultural extension or similar for your country for a second opinion, but this is a direct identifier for the disease.

Should you decide to keep the plant, then you might try any product that contains Rhizobium radiobacter. It might prolong the plant's life and control some of the symptoms.

This article may help:

https://www.gardeningknowhow.com/plant-problems/disease/how-to-fix-crown-gall.htm