A TSB is not a recall. It's a Technical Service Bulletin. Or, a Service Bulletin that's technical in nature. It may be related to a recall, but that's because of the technical details.
In simpler terms, consider it a topic specific training guide. That's all it is.
So, the more the merrier.
NHTSA has many of them.
STIS has all of them, in their latest and most up to date form.