Hi Ravishankar,
Yes you can do SSO between 2 different applications. There are mainly
2 ways :
1 - Both Applications are protected with the 2 SSO environments,
which share the same Key Store;
2 - Both Applications are protected with Federation SAML;
From you description
"The user logs into first app and the app has some service end
points from the second App (which is again configured for CA
SSO/SAML authentication enabled)."
So configuring SAML Federation between both entities will allow you to
log in the first application as IdP and browse the second application
as SP in SSO.
I hope this helps,
Best Regards,
Patrick