Absolutely not. Anyone who claims they are similar is spreading heresy. It’s like saying that two people who run in different directions, are running in the same direction, because their movements look similar. Look, they both run in a similar way!
It’s one of the biggest lies, spread mostly by the modern New Age aka “Spirituality without religion” types of thinking. If you really desire truth about those subjects, I encourage you to read “Riders of the Cosmic Circuit” by Tal Brooke (he’s a Prot but this is the best book, I’ve ever read on those subjects. Nobody seems as competent as this guy, most of them can’t lay their fingers on what exactly is it that happens to majority of the modern “Gurus”)
To sum up, those are two different paths leading elsewhere. One leads to a relationship with Personal Absolute, and the other leads to being dissolved in Impersonal Absolute, which according to one Orthodox monk is actually the created Absolute. His teaching didn’t convince me though so that’s why I reccomended the book above, which actually did. He convinced another man though, but he was practicing black magic as well as Buddhism, so the testimony is biased. You may check him out on YouTube nonetheless - Kenneth Klaus. He practiced both Hinduism, and Buddhism. Both of those could coexist with his black magic, and his pride. No teachers said anything.
From a Christian perspective therefore, Buddhism may be demonic. And despite the fact it contains certain truths, the path, the destination is self-annihilation, to be dissolved into an Impersonal Absolute.
If you were talking about Hinduism however, we could have a more interesting conversation. But in the case of Buddhism versus Christianity, they are pretty much completely opposed to each other.