Whats the difference between 66 & 69 steering Columns?

Doesn’t a 69 have a collapsible column? I know the 66 doesn’t. Also the turn signal assemblies are different. And isn’t the collar where the steering wheel mounts larger than the 66? I’ve got a 68/69 woodgrain sport steering wheel and although it will physically install to an early A column, the hub of the steering wheel is so much larger than the 66’d collar. I’d venture to guess it would be the other way around with a 65/66 wheel hub being too small for a 69 column.