LLs and early writes serve the same purpose, really just different terminology…the early communication telling an applicant that they are highly likely to be accepted come decision date (whether SCEA/REA/EA/RD). For example, William and Mary sent postcards this week to a number of RD candidates with the message that they are highly likely to be admitted, here’s W&M’s explanation: https://wmblogs.wm.edu/admiss/whats-postcard/