I recently (as in last week) bought a UDC Trainer 36" (new rider here). It also has the IA-1231-01 code on the tyre. I doubt that it came with a Nightrider Lite though, unless some parts has been changed/repackaged before sent to me? So, which one do I have?
Anyway, here is a link to the post about the Lite tyre where @rogeratunicycledotcom give some insight into the production → New 36” tyre