Compact yarns can be made from both carded and combed yarns. Compactness of the yarn is determined by the spinning process, not the preparation of the fibers. The spinning process used to produce compact yarn in ring spinning which involves twisting the fibers together in a compact manner, resulting in a dense and tightly twisted yarn. 

This ring spinning process can be applied to both carded and combed fibers to produce compact yarn. Compact yarn terms is used to describe the compaction process where yarn is inserted through a friction triangle to remove any additional fibre in the periphery to give the yarn a clean surface.

It’s important to check the product specifications and description carefully before making a purchase, and to communicate with the seller if you have any specific requirements or preferences. This will help you make an informed decision and ensure that you get the desired type of yarn for your project.

Combed cotton is a high-quality cotton that has gone through an additional process to remove any impurities or short fibers, resulting in a smoother and stronger yarn. 

Carded cotton, on the other hand, has not gone through this additional combing process and may contain impurities or short fibers.

Hence, compact yarns can be made from both carded and combed yarns.