The SafeZone Browser and Secure Line are two entirely different things.
If I put it really simple :
The SafeZone browser is just that.
It is just a browser, nothing more nothing less.
The "safe part" is basically only the pay mode that checks things the basic browser doesn't.
But it only does so when you visit "banking/payment" sites.
Secure Line encrypts (or at least is supposed to do so) all network traffic.