Different Power Cords in same system - ok or bad?

You've got to be kidding me.

I should preface my question by asking those people who really want to help to only answer. A sarcastic sentence is wonderful help, Devilboy. If you could care less, please don't answer anymore.

I think if all your equipment is from the same manufacturer and vintage then using all of the same cabling throughout is probably a good.
But once, that changes each component probably will react differently with different cables. At least that has been my experience.

I suspect Devilboy meant to say is, "Yes, it is ok to use different power cords in the same system."

With all the different factors that make up an audio system, including parts from many different manufacturers, feet and feet of transformer wire, different types of caps, hook-up wire, IECs, switches, etc. you are probably best off choosing whatever cables sound good to you. In a general sense, cable manufacturers sometimes have a house sound where certain cable lines for example provide more detail and speed in comparison to others that may provide more body and tonal density. But that doesn't mean using cables from only one manufacturer is going to give you a better sounding system.

The need to use cables from only one manufacturer is a pipe dream fabricated by people who fabricate cables when they are not smoking pipes. You no more need to use only one brand of cables than you would need to use electronics from only one manufacturer. IMO

You will probably get better sound by eliminating all that stuff, and going directly into the wall. Personally, I have never met a power conditioner that didn't screw up the sound of my system.