James GRIFFITHS & Margaret ROBERTS, Newland 1783 (General)
You are quite right with All Saints Newland and it's chapels of ease, Bream, Clearwell, Coleford and Redbrook. The separate and consolidated registers were well kept at that time and there was even an index compliled by the incumbent in the early 19th century which is in Gloucestershire County Records.
In addition to that people who were moving from village to village did sometimes get children baptised in both the old and the new parishes. The fear was the Poor Laws. People belonged to villages. If they moved and then had to apply for parish relief, they would be taken back to original parish (Removal Orders).
Roger