1)
What are the ramifications of the phrase "k'Mar'eh Tzara'as Or Basar"?
1.
Rashi (on Pasuk 42): It implies (a) that it requires one of the four appearances of Nig'ei Basar and (b) that it can last a maximum of two weeks.
1
2.
Ramban (on Pasuk 29-30): It implies that it is Metamei via a Michyah or spreading.
2
1
Rashi: Unlike Nega'im on a location of hair, which do not require one of the four appearances, and which last at most one week.
2
Ramban, citing Nega'im, 4:3: It is not Metamei via two hairs. See Ramban for reason.
2)
What are the ramifications of the phrase "ke'Mar'eh Tzara'as Or Basar"?
1.
Rashi (on Pasuk 42): It implies a. that it requires one of the four appearances of Nig'ei Basar
1
and b. that it can last a maximum of two weeks.
2
2.
Ramban (on Pasuk 29/30): It implies that it is Metamei via a Michyah or spreading.
3
1
Not like Nega'im on a location of hair (Rashi).
2
Not one, like Nega'im in the location of a boil and a burn, or three, like Nega'im in the location of hair (Rashi).
3
But not via two hairs (Ramban, citing Nega'im, 4:3). See Ramban for reason.
