For the USA basses:
G&L used to use Schaller pretty much exclusively. Then supply from Schaller become problematic, so the move was made to Hipshot. They have, in the past couple years or so, switched back to Schaller as the primary supplier with Hipshot running backup in case there are supply chain issues.
So, you will see lots of older G&Ls with G&L-stamped Schaller tuners, a few years worth of G&L-stamped Hipshot tuners, and now back to G&L-stamped Scahllers with Hipshot-stamped Hipshots running backup. Clear as mud, right?
As you might imagine, lead times when buying custom parts in quantity can be long and fraught with problems. Trying to keep inventory in check means that flexibility is sometimes necessary when sales outpace parts supplies. Gotta say that it's not a bad problem to have.
Fred's comments above are correct regarding the Tribute tuners. They are different critters and not directly compatible with their USA counterparts.
Ken...