Dramatically different. The RD doesn't really have the same midrange profile at all...it is far more scooped. With roundwound strings and EQ set flat, it's most like a muscular Jazz bass sound. The way I play it is with GHS super long scale heavy flats and lots of bass. It's more of a dubby, rubbery sound. Very thick.
My t-birds are much more about midrange aggression. Dark on the top, but with a big upper mid slice and a lower mid bump around 350-400 that makes every note very pronounced. Not a ton of super lows, but very satisfying nonetheless.
Jerose: "Don't forget LEDs!...you need enough to effectively render an assailant blind...once he's defeated you can reward yourself with Pez".