(By definition) If you have a cord that fits, use it. But it may have changed from what your previous TiVo used.
I've done that.You can trim a fish cord to work just fine with a knife, really..
The "fish" shaped one is polarized, the "infinity" shapped one isn't. If theI do not know why they changed the cord plug's design for Premiere.
All cords with the same shape connector are rated for the same load. Cords rated for higher loads have larger connectors.I took a cord from my old digital camera charger. I knew it was the right shape, but didn't know if there was differant power levels for these cords like transformers or power supplies have.