Pitchbend is like two linked CCs, MSB taking one step for every 128 LSB steps:
Gives 128 x finer ‘resolution’ than CC (though I bet few of your controls with a PB wheel/strip go close to achieving that resolution!)
Do you mean the effect of the maximum LFO depth being more than say ±6 semis?
Can you change PB range in your synth? (many will allow a maximum range of ±2 octaves, others (eg some Volcas) will respond to PB but not allow you to change the range.)