I *believe* this will work. A couple of things to consider:
- During the migration process there will effectively be 2x the number of snapshots on the volume. Just be aware of that as there could be an issue with the maximum snapshot count.
- After the migration, and the valid recovery window for the virtual machines has expired, you will want to ensure that the snapshots from the originating system have been removed from the volume. Be careful removing these, I'm not sure that there is any difference in the naming scheme, so it might not be obvious which VSC instance created them.
If you have concerns, I would open a support case and work with them to validate that your transition plan will ensure there is no lapse in recoverability for your virtual machines.
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