Yes, although monetization depends on the Rumble license you select for your videos. In all cases, your video can be on both platforms at the same time regardless if it's monetized or not. Whether or not your video is already on Rumble, you can always upload it to YouTube.
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Exclusively licensed on Rumble
If the video is currently exclusively licensed on Rumble, Rumble will claim your video on YouTube (and both platforms will be monetized).
Exclusively licensed on Rumble excluding YouTube
If the video is licensed in Rumble with an exclusive license excluding YouTube, Rumble will not claim the video or upload it on YouTube (monetization and management of the video on YouTube will depend entirely on the creator).
Licensed for Rumble only
If the video is licensed for Rumble only, the video will only be managed on Rumble.com.