I have never figured out if the front and back lines are all same length on different makes of kites. This has stopped me from trying my cabrhina bar on my ozone kites. I guess I could unwind them and measure but I am lazy and hope someone on the forum can tell me. It would be nice to know if switching bars on different makes of kites would work when something fails and you need a spare.
all modern kites use equal lengths. Older kites did have unequal line lengths but that has been discontinued on almost every model.
Cabrinha, and other mini-5th line kites pinch the kite if you use them on a single center line flag out kite like Ozone, also the safety works differently. A mini-5th depends on the bridle depowering the kite, while a single center line flag out like ozone actually flags out the kite to one line.
As of 2012, I think you should be able to swap all these bars
mini-5th line cabrinha, best, north, airush, epic, switch, gk, core
or . . . swap any of these brands with single center line flag out ozone, slingshot, liquid force, wainman, blade, naish
You can try swapping bars cabrinha and ozone to see what I'm talking about. I think the cabrinha will fly better on the ozone bar than the ozone will on the cab bar.
I have a bunch of bars with different line lengths for different conditions quicker than changing lines and extensions.