I just bought a peavey vypyer 75 watt amp this weekend, and something I found was that the power cord was somewhat short.
I also have a line 6 spyder, which is a 15 amp... and it's power cord is longer.

Would it be bad to use the power cable form the 15w for the 75w, or will it not have any effect
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its the same

Epi Les Paul Std w/Duncans
Cry Baby From Hell
Marshall JH-1
EHX Metal Muff
MXR EVH Phase 90
Carl Martin Classic Chorus
EHX #1 Echo
Ibanez LU-20
Dunlop DCB-10
Crate V50112
Tascam US144

Or just use an orange extension chord.
Gibson Les Paul Studio
Highway One Telecaster
Dean Evo
Mesa F-50
Laney GH50L
Vox AC30 C2
Ampeg V2
Assuming the two have the same female end, you'll be fine. The cords don't do anything to the power, they just bring it from the outlet to the amp.