Does destination LUN size need to be the same with source LUN for timefinder/clone

According to page 32 of the Solutions Enabler Symmetrix TimeFinder Family CLI 7.1.1 Product Guide

The source and target devices can be either standard devices or BCV devices as long as they are all of the same size and emulation type (FBA or CKD).

Clone copies of striped or concatenated metadevices can also be created, but the source and target metadevices must be completely identical in stripe count, stripe size, and capacity.

However according to EMC knowledgebase article emc201553

While cloning bigger meta devices could be used as target,  the target must have same number of members and same configuration (striped/concatenated) of source volume.
Thus each single member CAN be bigger, but the metavolume structure MUST be the same.

This support requires the following SYMCLI environment variable be set:

SYMCLI_CLONE_LARGER_TGT = ENABLED

The following limitations apply:

• Restore is not allowed Full Copy support only; cannot use -differential
   
  
• Concatenated meta devices are not supported
   
  
• Exact pairing are the only operations allowed, as follows:
  
  -file
  
  -g or -cg with -exact
  
  -g or -cg with source and target ldev name supplied
  

Sam Claret EMC TSE3