clutch & brake hydraulic lines/fittings the same?

[Actionclaw]

Would anyone here know for a fact if the clutch hydraulics and brake lines (on a Nissan 240SX) both use the same hydraulic lines and fittings?

I tried using a standard (foreign/metric) brake line (with an inverted flare adapter) connected to the clutch slave cylinder rubber hose. Everything seemed to thread correctly yet, once reassembled, it leaks. It is on straight and I don't think it can be tightened any more. I'm wondering if, perhaps, the size, thread pitch, etc.might all be identical except one is "double flare" the other "bubble" or something similar?

Any reference info available that might specify sizes, types, etc.?

Thank for any help.