1)
Why does the Torah specify the Emurin by the Asham and not by the Chatas (in the previous Perek)?
1.
Rashi: Because, whereas it already listed the Emurin of the Chatas in Parshas Vayikra, it did not list those of the Asham there.
2)
Why does the Torah mention the 'Alyah' independently?
1.
Rashi: Because all the Ashamos are either rams or sheep, both of whose Alyah is included in the Emurin.