If these two methods are not based on the same idea, then you can only apply for two inventions. ^_^
To apply for a patent, it is not necessary to create a physical object, as long as it can clearly explain how the technical scheme of the invention is realized; If you can't even come up with the second technical scheme, I suggest you don't apply. Moreover, since you can't figure out how to realize the technical scheme, others should not, and you don't have to worry about other people's applications.