Hi Shubham Thanekar,
No, You can’t you need to buy separate node for your 2nd application or you need to build the functionality in the same app, separated by user roles, but this is not a long term sustainable solution.
No, that is not possible. Yes, Mendix requires you to buy a separate license node. Btw. you best ask this to your contact at Mendix directly. He/she will be able to give you a more detailed answer.