Hi, I can't understand why in the chart of account of 1 client I can also change the number and in another client environment I can't. Is it an accounting preference?

There is no workflow which might be disabling it.

A workflow deployed on COA account that is removing other columns except the name?

Check scripted records page for account. Check the custom form

it does not look like the second instance has many provisioned options; first bus is manufacturing, what is the second one?

There are no custom forms in the scripted record list