I'm fascinated by all the underachievers downvoting me.
Do y'all really not read Hacker News while board sitting on the couch? Discover a new programming language that looks interesting? Play with some new database technology? Read a reddit sub related to technogoly, etc. after the hours of 9 to 5? Vibe some fun looking idea, even if you just throw it away?
I'm kind of doubtful the people who are actually spending time learning something on Hacker News fall really into the category that they're not working on their career growth outside of work hours....
some people see 'career growth' as going to seminars and networking with manager types.
some people see 'career growth' as opening up a new technical manual and acquainting themselves with new stuff.
I think it's import to differentiate; networking with managers and going to industry-specific (or even company specific) seminars offers next to zero enticement for me, but I usually always have the time to read about a new language or tech.
In other words: If a growth opportunity arises, i'd rather it be personal growth.
I don't think it matters how you define it. Engineering career growth is almost always going to be about understanding the new technologies, gaining communication skills in navigating an org. etc....
What you're calling personal growth is 100% related to career growth. And you sound like someone who does do things outside the hours of 9 to 5 that intellectually you find interesting, and likely makes you better at what you do 9 to 5...
You're going to show up at that meeting someday, there's going to be a problem to solve, and you're going to have some ideas for things to try that are answers, because you read about that new tech. And someone's going to tap you on the shoulders to lead that or what not....