Rooster59
Contributor
Can you jump in the pool with just yourself, no gear? Exhale, you sink, right? Full breath, do you float?
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In theory, yes, and in reality, some. But I suspect the area of neoprene covering your body is a much bigger factor in your diving buoyancy than your body composition. So, for example, if as a result of your weight loss you now use a Large wetsuit instead of a XXL wetsuit, that probably makes at least as great a difference as the loss of 20% body fat.
People seem to be overlooking the part of your original post where you said you "won't have the opportunity to do a weight check" before your trip. As you seem to understand, there is no way to get an accurate answer unless you do a weight check, by getting in water with your rig on, or weighing your rig by itself in a pool, etc. We're all just generalizing with our replies.