If you wish to believe that, or if you wish to believe the OT stormtroopers were a copy of a copy, then both would support why the OT stormtroopers are pretty inefficient fighters while the PT stormtroopers were pretty bad-ass.
Or, the third option is to go with what Lucas has actually stated: That the OT stormtroopers were a mixture of clones and regular folk. This supports the vision created in "TROOPS" that people would just go down to the local recruitment center and sign up.
If you're into the EU, then you definitely know that clones came from sources other than Kamino, and could be grown in months, not years.