تعریف و معنی "a horse of a different color"در زبان انگلیسی

I thought I was going to a boring lecture, but the professor's teaching style was a horse of a different color. She used interactive games and group activities to keep us engaged.

The company's usual strategy of cutting costs did n't work this time, so they had to try something different. This new approach is definitely a horse of a different color.