That's right. 69 was the year that the alternator/air compressor swaped sides on the engine. As far as I know, ANY BB passenger car parts will work for you. I think, but won't swear to it, that the pickup compressors remained on the left side.
And while we are on the subject, the same would hold true for SB compressor/accessory brackets.
For example, if you have a 69 and need a particular bracket, you should be able to find it on a 73 Caprice, for example.