Kbin has upvote, downvote, and boost. Boost comes from the micrblogging side, kbin does both content aggregation like Lemmy and micrblogging like Mastodon. On the content aggregation side boost counts as 2 upvotes and it functions as normal for the micrblogging side. Kbin.social is the only Kbin instance I used, I expect that it works the same on other Kbin instances and on Mbin but I don’t know for sure.