yes G60 chargers are more fragile. People have used them on G40s here in the UK before to good effect, they can produce 1.6bar boost (about 23psi) on a g40 engine which gives a lot of power. But they are more prone to failing than a g40 charger. They don't really like the fast-revving nature of the g40 engine in comparison to the lazier tall-block g60 engine. I hope that makes sense?
The lad who was running 1.6 bar (who is on here sometimes) went through a fair few g60 chargers in his time.
To be honest, if you are wanting a lot of boost I'd put a turbo on it (and in fact I am doing with mine!).