I think the answer is, it's hard to say.
Do they have the resources to track you that way? Possibly
Do they care? Unlikely
There's a lot more to tracking than the IP address or a device identifier. For example there's browser fingerprinting, which is taking the many properties your browser has to load a webpage the way you want it to load, so to speak, but that can be used to track you.
In theory you could be tracked cross-account if they have enough data about the way you used these accounts, they could see that you use (or used) that account in a similar fashion to the other one, use the same services, make the same types of requests, listen to the same music.
Basically, it is hard to say, maybe someone else will be able to give you a more precise answer.
Either way, remember, you are part of the 0.01%, what Google wants is cash, although they probably could find a way to track you either way, it is a lot of effort to put to extract the same amount of money from the 0.01% as the 95%, it's unlikely that it's worth the effort when really the 95% are just giving out all of their information willingly.