Yank the current article into an already existing Message composition
buffer (gnus-summary-yank-message). This command prompts for
what message buffer you want to yank into, and understands the
process/prefix convention (see Process/Prefix).
Attach the current article into an already existing Message
composition buffer (gnus-summary-attach-message). If no such
buffer exists, a new one is created. This command prompts for what
message buffer you want to yank into, and understands the
process/prefix convention (see Process/Prefix).