Assuming all the classes are identical in both namespaces, then I think you can just copy over the underlying global arrays that hold the table data. You'll need to know a bit about the naming rules, etc. to find the globals, and a bit of programming to clear them out in the target beforehand. (The classes could be copied over separately.) If the namespaces are on the same network, and the tables small, then Merge commands could be used.

The documentation examples all have <sequence> blocks around the calls and sync. Your code only has a <scope> block in the bit we can see. Maybe try adding a <sequence>... </sequence>?

Actually, thinking about it, the behaviour is as if you had in the sync an attribute:
type='any' 
but I can see you have:
type='all'
Maybe try changing the "type"? or removing it completely, as the default is "all"?

All I can think of is the timeout setting. The documentation says it should be in seconds, i.e. an integer, but you have "PT30S" which might be treated as zero?