If both the application is on same server, then the login URL is same for both. before login Pega can not decide which application is the user belongs to. So, we can not have different log in page.

Way out can be below:

Create 2 authentication service. Now you would have 2 URL for the same server. As both the authentication service is going to create 2 servlet.

Now you have one unauthenticated rule set which is attached to the authentication service. In the ruleset you can override the log in page.

you can use window.location.href to get the url and based on that you can show different log in page.

theoretically looks feasible. please try it out and let us know the results.

-Saikat