I tried "landscape lighting wire" when I was running Quad 63 electrostatics (very revealing, even minor changes). At the time I also had audiophile-correct "speaker" wire from Kimber, Linn, XLO, probably others. I heard no difference at all, except for the XLO which adds silver strands to the copper — that's a metallurgic difference, and that difference was minor.
Ultumax, it seems you've read a lot on the subject. Inevitably, some misinformation creeps in — it shows when you ask "Is this wire the same as speaker cable?" Try to forget some of that 'knowledge' — it isn't knowledge. Wire is wire — calling it "speaker cable" only fancifies it — and they all conduct electricity. Some wire is altered ('improved') slightly at the margins, and a difference might be heard, but it costs more and its benefits are still controversial.
I see questions from 'newbies' who are so influenced by reading rubbish that they think "plain wire" won't even work, or will sound hideous, or destroy their speakers, or.... Same with bananas — any of the recommendations here on AK have been tried and tested, and will be fine.