they are the same in terms of being a gear type LSD. Here's the technical info from their website, which also shows some comparison to Quaife's LSDs:
I've heard of people with 800hp cars using these diffs with no problems. I was also talking to a representative at VAG Motorsports in montreal, he was saying he's used this diff in his race M3 (or his brothers??) and in plenty of bmw's with no issues. I know they're also really popular among 135/335 owners.