what is meant by organic and ethical seo and how it is different from each other?

Ethical seo refers to the white hat seo technique that follows Google webmaster guidelines. Following the guidelines help to keep your website safe from any search engine updates.

Finally you can say both are same, If you are following search engine guideline.

*Organic SEO is the approach to get traffic from natural rankings in search engine result page.
*Ethical SEO or white hat SEO is the is the process or techniques for search engine optimization and marketing using strategy, steps, technique or process defined by search engines like Google.