Here's how much people pay attention in clubs: Back when "Stairway to Heaven" was THE song, my band recorded our version on a four-track, then played it back through the PA that night, miming to it. At the break, where it gets rockish, everyone in the band traded instruments. The drummer took the guitar, I took organ, etc. When we took our break, people came up to me and said "I didn't know you could play organ." Same thing with the other guys. So -- you can be pretty much assured that very few people will know if you don't play the "right" bass part. Still, that's not gonna stop me from playing "Dear Prudence" note for note or drive me to "make Funky Broadway my own." There's a reason those parts were played the way they were.
Now, if you ask me to play straight eighth notes on just the roots "just like the record," I'll argue with you.