The DP tuner is tied to the PCM module CODE, NOT the VIN.
The PCM module has a code e.g. VLB3 on a sticker attached to the PCM. The code can be shared amongst many VIN's, typically similar year, powertrain and configurations. If my module has the same code as the seller's PCM module the tuner will work on my van.
A duplicate sticker with code to facilitate service was often placed on the forward driver door jamb. But these are usually lost over the years. The sticker on the door jamb was far easier to read than pulling the PCM or contorting under the dash.