I concur with steelbikeguy above. Likely most are 2° taper but its the taper length that gets to be trouble.

This is different than overall or between bearings.

Mix and match is a crapshoot to get the chainline, avoiding the arm base casting too close and bb interference. Then just as one successfully has the non-drive perfectly seated, the other may not because the drive side taper might be longer!

For the bb spindle fastening bolt type, there are some hacks to make it work but most here would cry foul and club me. So never mind.... 💨