Can I use Solution Builder on newly created Client?

Dear Experts,

I have an existing SAP system and I created new client via SCC4 without doing any client copy (means it's blank).

Can I logon to the newly created client via SAP* (since there's no other user id) and run Solution Builder to activate those SAP best practices Building Block? Will that affect other existing client (what I mean, will there be a cross-client customizing?

regards,

Abraham