I had the same query as the r32 bars come up quite cheap.
Couldnt find any definite proof so tried it myself.
The R32 Bars are thicker and solid, so in theory an upgrade, but are a slightly different shape as they need to clear the drive gear.
I have fitted front and rear to my GT TDI and they do physically fit, although it's quite tight.
The rear fouls the pipe coming from the back box too.
Saying that, they've been on for 12K now without any major problems.
I'll try dig out some pics to show the difference.
It's best to go with some of a 2wd model.
Jas