Exporting an album in its order and with its titles

When you export and send the photographs to the Finder, then the sorting features available are only those that the Finder has. While, in Photos, you can drag images into any order you like in an Album, no such feature exists in the Finder, which sorts on File Name etc

Have you tried prefixing the title with a number: 001, 002, 003 etc?

You can get the photos in the order you want in three ways, only one of which will have the same file name as the original, i.e. Terence's suggest method.

The other two methods are to arrange the photos in the order you want in an album and export:

1 - with File Name = Album Name With Number

which will give you this:

or

2 - File Name = Sequential

which will give you this: