The Encore Plumbing - KL50-0220 has a 3/4" fitting.
Because of the specificity of your question, I would recommend calling our sales floor directly at 1.800.447.4941 and a representative will surely be able to assist you in getting the exact connecting parts for your needs.
Yes, it will fit that brand.
You would need to use an adapter with a 3/4" female thread and 1/2" male thread. Encore does not make these, but give our team a call at 888-388-6372 and they can help locate the right fit for you.
I am sorry, this spray head does not have variable spray options. I have attached the specification sheet if you are interested. http://www.componenthardware.com/documents/KN50-0220-12.pdf I have also attached an adjustable spray valve that does have multiple power settings below. Hope this helps! https://www.etundra.com/commercial-plumbing-supplies/pre-rinse-parts/spray-valves/encore-plumbing-kl50-y102-01-adjustable-pre-rinse-spray-valve/