For new production tubes getting close to a Cca is somehow difficult, close or better than Cca can be found only in old production tubes, like Siemens E188cc A frame, Tele Cca, Mullard CV2493, Tesla E88cc gold grid, Reflektor 6n23p SWG.
Extended and lush are Amperex Holland E88cc, E188cc, Amperex USA, Siemens E188cc, Mullard CV2492 dimple disc, Brimar gold grid, All of them old ones.
E188cc/7308 is a more quiet tube but generally tubes in this family can become easily noisy.
New production, the Golden Lions are warm and reasonably extended but not close to Dutch/British, German or USA tubes.
Russian NOS alternatives are more linear in presentation, extended with great bass, are quiet, more robust and depending on production years they can surpass anything out there at a lower cost. Though lately their prices have gone up considerably due to demand for the better ones.
6n23p-ev is an alternative for sweet sound, though this tube is not exactly the same as a E88CC, but is ultra quiet and can take a lot of punishment. Still it is older stock and not current production but can be found easier.