Yes, the plants mentioned above are all registered plants. You can look them up in the database, link below. Looking them up poses a question. One is tetraploid and two are diploid. So probably not a correct cross identification as dips and tets don't mix.
If you're a beginner, you can probably get seed for asking. You can search here for seed starting techniques and find plenty. I wouldn't pay much for seeds until I was confident I had a good procedure to start the seeds and grow the seedlings in place. Just my opinion. Good luck, have fun,
Ed

Here is a link that might be useful: AHS database

I looked it up and sure enough, you're right! Haha. I'll ask the hybridized about that. But how can you tell the seeds are already registered? Sorry for so many questions!

Seeds are never already registered. Only plants can be registered.

I meant, has somebody already crosse these too plants and registered the outcome?

It doesn't matter if the outcome is registered, as your outcome will be different....each seed produced, produces a different plant....no two seeds will give you the same plant, regardless of parents..
Hmmmm, think out it like us humans....parents produce three children....each is different and unique, even though they have the same mother and father.
Hope this helps.

Oh! Haha, thanks! So, even though the cross is registered, if mine is extraordinary (highly doubt it) then I could register that seedling? Thanks so muh guys! This was my first post an so far, I feel welcomed here.

A plant with the same cross may have been registered; don't know.
Any seedling that you own when it first blooms may be registered, extraordinary or not. Just takes money and filling out a form.
Ed