你好！Ivan， They two are almost same. But a little deference: "抓住“ emphasis : hold and don‘t missing it. The Structure is: V +O Mostly following by: 抓住机会、抓住机遇 "把握“ emphasis: hold and try your best do it . The Structure is: V +(complement)+O ,like：把握（好）这次机会、把握（住）这次机会 Hope that's helpful for you ! Thanks~ 欢迎大家讨论补充哦~

兩個是一樣的意思 例子 : 僅僅埋頭苦幹是沒用的，懂得把握(抓住)機會才有可能會成功 Edit : Your example is correct

Actually there is a difference. “把握机会” means "抓住机会“ and take good advantage of this opportunity. Example: 现在你抓住了这个机会，就要好好把握这个机会。