Anyone know anything about disc brakes?

What's the cross compatability of olives and barbs like across brands? I've a pair of TRP Hylex to fit in the near future and it'd be good if Shimano bits were compatible.

Bizarrely Shimano olives seem to be a very tight fit, and the barbs push in a little too easily on the TRP hoses. I've got it together, just about, whether it's sealed I'm not sure.