Yes. All Ambassador licenses are perpetual licenses with 2 years of updates included. You can continue using your Ambassador license to continue building the applications that you had requested to be included with the license. Check your Slint License Certificate to see which applications are included.
Yes, if the new application was included in the Slint license certificate issued when you received the Ambassador license. If the new application was not included, then kindly use the Slint Royalty-free license for building the new application.