Well...Are they the same thing?
If you can play bass guitar, can you play upright bass?
Or are they as different as night and day?
I have a friend with an upright bass for sale for $2k. It even has an EM pickup in it, even though it's an acoustic bass.
What do I do? Grab it in the hopes of playing it someday?
Or is it so different that I'll never learn it?
First of all; I'm sort of adverse to telling people what to do. Or, what to buy. However, here's what I think about the subject - in general terms;
- If you can play a bass guitar, can you play an upright bass? Some people can; some people need lots of practice. And, some people can't do it at all. Personally? I can't play an upright bass - for several reasons. And, yes; I have tried - a couple 3 times... it did not end well...
- Are they as different as night and day? Well... IMO? Not quite. Leo Fender developed his electric bass guitar as a handy, compact substitute for the upright bass, and the first people to use them were, indeed, upright bass players. Who, apparently, had little trouble switching from one to the other. But... yes, the way they're played is quite different. But, not different enough that most people can - and do - adapt...
The main difference is that upright basses are fretless. And, most electric guitars are fretted. But, there are a good selection of fretless bass guitars, both lined, and unlined. Which brings me to -
- Learning to play a fretless bass. It takes 2 things to play an unlined fretless bass; a good sense of pitch, and lots of practice. I have 4 fretless electric basses in my "Herd" - but, they're all lined. There's a thin line of contrasting material where the frets would be; so, playing one of them is pretty much like playing a fretted electric bass. I need the lines, because I'm pretty much tone deaf; I can't really tell - by ear - what note I'm playing. Which, to play an unlined fretless bass - upright or electric - you sort of need to do. And, to do it? Takes lots of practice...
So... what should you do? I'm not going to tell you what to do - other than "please yourself". If you have a decent ear for pitch, and you want to give it a try? Go ahead. My main problems with an upright bass - aside from not having a lined fingerboard - are that I'm very left handed; and very, very few upright basses are leftys. Plus, I have a badly damaged left shoulder, and putting that arm in the position it need to be in to pluck an upright's strings, is very painful after a couple of minutes. So... I, personally, cannot play an upright bass. However... that doesn't mean that you can't play one. Try your friend's upright, and decide for yourself...