There were reports of internal codes of conduct in 2007 for the TB. Nothing new, except perhaps for Al Jazz.
If you mean the attached, there appear to be some differences suggesting Al Jazz's document may be new:
1) while the old "code" says;
Anyone with a bad reputation or who has killed civilians during the Jihad may not be accepted into the Taliban movement
the new document is more specific about avoiding civilian casualties:
"Governors, district chiefs and line commanders and every member of the Mujahideen must do their best to avoid civilian deaths, civilian injuries and damage to civilian property. Great care must be taken."
.
2) The 2006 code talks about unit consolidation:
A group of Mujahideen may not take in Mujahideen from another group to increase their own power. This is only allowed when there are good reasons for it, such as a lack of fighters in one particular group.
while the new document appears to be more specific dealing with creating new units:
"Creating a new mujahideen group or battalion is forbidden. If unofficial groups or irregular battalions refuse to join the formal structure they should be disbanded. If a governor or leader has in the past had a unit or active group in another province, they should bring it to the attention of the leader of that province. That leader should then take over command of the group."
3) The 2006 list o' rules doesn't go into this level of detail re: "civic action":
"The Mujahideen have to behave well and show proper treatment to the nation, in order to bring the hearts of civilian muslims closer to them. The mujahideen must avoid discrimination based on tribal roots, language or their geographic background."