CC does scaling.
Salling the whole point cloud , not parts of it to match areas, you can scale the scan , it will not change its original volume measurements.
Every software have different model scale .
But i think this is exactly the problem: before merging you have 2 point clouds with very very slightly different volumes → you get seam lines, which are very very small edges or steps. Scaling the two different pont clouds in the process of merging to fit each other not roughly but exactly would help a lot.
Do you really move the slider in steps until the max? May this be THE way=
I hate it , but I do move it even for regular scans to ensure nothing is hidden. From 1-100 it is really annoying job , if scan is too messy I just use noise cleaning in CC all at once with one click then replace the fused scan in my project .
I do agree the line between the scans is still visible if scans are done while holding the scanner , it should be not that why for organic models I merge only in CC .
I am going to make my last attempt in this case next week .. it really need to be fixed because it is so annoying 
Merge should eliminate all points automatic after merge without the needs for cleaning . As it once was
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