CM5 is just shorthand for Compute Module 5. It's a raspberry pi 5 in a different form factor. Until it's released we can't know all the exact differences without apparently signing up for an NDA'd spec sheet. But see https://www.makeuseof.com/raspberry-pi-4-vs-raspberry-pi-com... for a breakdown of how the PI 4 and CM 4 differed.
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Okay, I'll bite: what's going on? Seriously. I know what a Raspberry Pi 5 is, I have one. No idea what I'm supposed to take away from a "CM5"
CM5 is just shorthand for Compute Module 5. It's a raspberry pi 5 in a different form factor. Until it's released we can't know all the exact differences without apparently signing up for an NDA'd spec sheet. But see https://www.makeuseof.com/raspberry-pi-4-vs-raspberry-pi-com... for a breakdown of how the PI 4 and CM 4 differed.