SSL,IIS: One website for multiple sub-domains and one website for the top-level domain (with or without www.))

I have multiple sub domains that should point to the same website and the top-level domain should point to another website. All of these are under SSL. For example:

abc.mydomain.com ---> Website A,
def.mydomain.com ---> Website A,
ghi.mydomain.com ---> Website A,
jkl.mydomain.com ---> Website A

mydomain.com ---> Website B,

www.mydomain.com ---> Website B

I have already purchased a wildcard ssl certificate and a dedicated IP. Can both websites share the same IP or should each one have its own IP?

I don't need wildcard host headers or wildcard DNS mapping. Every time, for each new sub-domain I am able to add a new DNS record and a new host header for the Website A.