Same surface different deep (SSDD) problems are a concept from Craig Barton, where he asks different questions based on one concept. You can read all about them here on Craig’s website. There are plenty of resources that can be used for IB, mainly look through the A-level content. I have also started developing some for the IB. Here are my attempts so far, all made in Google, so you can copy for your own class.
They are also added onto my website under the appropriated lessons.