Basic cable question

Hi everyone---I'm new here and a fairly 'new' audiophile. I'm currently updating my system and just need some basic advice. I've heard two different opinions on interconnects and speaker cables. I have Transparent speaker cables and standard stock interconnects which I'm updating next. The Transparent salesman told me that I need to keep my interconnects with Transparent as well---is this true? I guess my real question is: do speaker cables and interconnects need to be the same brand? Thanks so much in advance!