No, not just like IPv4. My IP address is 192.168.0.23 right now, as are millions of others. Add in CG-NAT from my ISP and I do not have a globally unique identifier.
On the last 64 bits, yes. On mobile phones, the first 64 bits may be fixed. This was something I argued against when I was at Vodafone Group, but didn't get any traction. That was a while back, but I'd assume that this is still the case, and that mobile phone addresses can be used for tracking.
