And Jtinn, too, strikes out! :-)
The 200Watt amp has 3dB more power than the 100Watt amp. 1.3V. is 2.72dB higher than 0.95V., VERY close to 3dB different. Therefore, the 200Watt amp will produce almost exactly 100 Watts with an input of 0.95V.
Of course, as Jtinn already indicated, the 200Watt amp will indeed deliver 200 Watts into 8 Ohms with an input of 1.3V., whereas the 100Watt amp will merely clip badly with an input Voltage of 1.3.
So you'll get the same gain and subjective loudness* with the 2 amps, but the 200W. amp will have more headroom...3dB more.
* unless both are driven VERY hard
.