You can find both .spb and .spba files as contacts libraries exported using Samsung Kies, but they are made using different version of the program. It probably is not easy to make an older file from the newer one. However, if you are just after the contacts you can just sync them via Google Account.
Convert Samsung Kies exported phone contacts library to Samsung Kies phone contacts library.
We found 2 software records in the database related to .spb to .spba file format conversion.
Microsoft Windows software - convert spb to spba on Windows
A free software for managing of latest Samsung mobile devices
Convert from spb file format
|Yes, Samsung Kies supports spb file conversion as a source file type.||Yes||Yes||spb editor||Yes||No||No||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned spb to spba. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert spb to spba on OS X
Management and sync utility for Samsung mobile devices