Hi Nadine,
Lismore was the original parish name. The church was on the Island of Lismore, at the end closest to Appin (part of the same parish on the mainland). In 1749, a church was built in Appin. Presumably at this time, the parish became known as Lismore and Appin - that is the name given in the 1840s Statistical Accounts for Scotland for that parish. A "government" church was opened in Duror, a district of Appin, about 9 miles from Appin Church (possibly in 1833, or at least that is when the earliest records date from). The Duror church was attached to the districts of Duror and Glencoe
quoad sacra. The civil parish, while including the
quoad sacra parish retained the name Lismore and Appin.
(Information from the 2nd Statistical Account of Scotland, Lismore and Appin parish)
online at:
http://edina.ac.uk/stat-acc-scot/
It looks like the LDS have used the traditional name for the whole parish as Appin for their index. GROS, and hence ScotlandsPeople seem to have used the separate titles for Appin & Lismore, and Duror.
The actual registers are as follows.
525. LISMORE, APPIN AND DUROR
525/1
Lismore: B 1758-1819, M 1777-1801, D -
Appin: B 1751-1819, M 1767-1819, D -
525<sup>1</sup>/2
Lismore and Appin: B 1819-54, M 1821-54, D -
525<sup>4</sup>/1
Duror: B 1833-54, M 1833-54, D -
Presumably the marriage (or at least the calling of the banns) you mention was in the government church in Duror, and is recorded in the Old Parochial Register (OPR) 525<sup>4</sup>/1.
All the best,
AndrewP