Shimano Hydraulic disc brakes- Lever compatibility
According to these pages:

http://productinfo.shimano.com/#/spec/2.4/MTB/Brake%20%28Disc%20Brake%29?q=M446
http://productinfo.shimano.com/#/spec/2.4/MTB/Brake%20%28Disc%20Brake%29?q=M395

These brakes both use the same hose kit, SM-BH59-JK-SS.

In document EV-BR-M446-F, the connecting bolt unit has part number Y8H298010.
In document EV-BR-M395-F, the connecting bolt unit has part number Y8H598010.
For both, the Olive &amp; Connecter Insert (barb) has part number Y8H298020.

I can find no information on the difference between Y8H298010 and Y8H598010, which may be superficial. If you have the fluid and funnel necessary to bleed the brakes, I suggest you unscrew the two hoses and measure the threaded fitting.