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Other than having much less variegation, it is quite similar. I would say that you could use them, interchangeably. Manhattan will be just a bit taller.

https://www.gardeningknowhow.com/ornamental/shrubs/euonymus

Unfortunately, we do not recommend specific places for purchase. If you cannot find them, locally, many online gardneing centers will ship to just about anywhere. Myself, I do not have a particular vendor that I use. Typically, I will go for whoever has the best mix of quality and price!

This could be crown gall going on. Also, it's hard to tell in the photo, but that might be scale on the stem in the last photo.

This info should help:

https://hgic.clemson.edu/factsheet/euonymus-diseases-insect-pests/

I would agree! That looks to be Euonymus fortunei.

https://www.gardeningknowhow.com/ornamental/vines/wintercreeper/wintercreeper-vine-control.htm

Make sure the pot has drainage holes. If not, you can add them. You can use regular potting soil. The plant will probably outgrow the container but you can always upsize. They can be pruned or sheared to shape it or control the size. Just trim it to your liking. Here is more on their care:

https://www.gardeningknowhow.com/ornamental/shrubs/golden-euonymus/golden-euonymus-care.htm