HELLO UMER SYED..
I also agree with aasif bashir dar here that the total gain should be same…As far as gain of the EDFA depends on many parameters such as EDF length, pump power, operating wavelength etc. EDFA gives different gain at different wavelength because of strak split in the energy band of EDF which led emission at range of wavelengths (C-band or L-band)…
Gain is relatively flat in L-band compare to C-band, however, value of gain is higher in C-band compare to L-band… I hope it will help you.
thanks & regards