Type approval number HANSA safety valves

Question:

I have an existing PSV installed on my system with model number SV.16-11018.123.DG.0,51.p. Now, I purchased a new valve to replace and it's model number is SV.21-11018.123.DG.0,51.p. Is there any difference between the two models? I can see the area and set pressures are the same.

HANSA answer:

Both valves are the very same. The difference in the type approval number is the year when the approval is re-issued. This is done every 5 years (in this case 2016 and 2021) and reflected in the approval number at the beginning.

SV.16-11018.123.DG.0,51.p.
SV.21-11018.123.DG.0,51.p.