Can an EL34 tube be replaced with a KT88 or 6550?

Hi, I bought an integrated tube amp called Cheer EL34. Yeah, it was made in China so maybe not the best quality, but it seems to sound pretty good. It uses EL34, 6SN7, 6SL7, 5Z4P tubes. I was wondering, if the amp has auto biasing, would I be able to insert a KT88 or 6550 tube for the power section? I'm not sure if the socket arrangement is different. What would happen? Would the tube blow up or something?