Both keywords can be helpful for client disbursement sheets, here's the difference.
##{{ net_client_issued }}: The actual amount of the Client Check that was issued on the Client Trust section of the Settlement Tab. Shows in italics at the bottom of the Negotiations section of the Settlement Tab and as a check on the Client Trust portion.
##{{ net_client_projected }}: The projected net to the client (before a check has been issued). Shows at the top and bottom of the Negotiations section of the Settlement Tab.