ATEM Constellation 8K Audio VS ATEM Constellation HD Audio

Question, Does the Constellation HD have the same audio card that is in the Constellation 8k?

Do you mean in regard to processing or interfaces? The answers are 'yes' and 'it depends on the model', I would say. The 4 M/E version has MADI input and outputs and stereo TRS in and out, just like the Constellation 8K.