I'd say it is a good starting point to try the same die number. But I never had the chance to try pellets from the same die but different batch / production year. So I don't know if this will work.
Next to the die there are more variables of which the batch of lead that is used could be a decisive factor.
The way the lead is produced (melting, cooling, stretching, storing, aging) has an effect on the crystalline structure and because of that on the way it responds to the pressing in the die and the rest of the manufacturing process.
It would be very interesting to hear your results!