Sub Cable Question?

So on my current HT setup, I'm using a Monster sub cable from receiver to pre-wired jack in-wall. Then from another in-wall jack, I'm going to my sub(SVS PCi-25-31) via a Radio Shack Gold Series sub cable.

My question is, I'm setting up another HT upstairs and need to hook up my new SVS PCi20-39 in the same manner, but I'm thinking about using Radio Shack Gold Series Mono cables rather than sub cables. They're cheaper and I've heard that both cables are still 52ohm?

Any thoughts here, or reasons why I can't use mono cables instead of sub cables?

Thanks,

Mike