2nd AIRLANDING ANTI-TANK ARTILLERY:QUESTION

[HamandJam]

Hi I am new to the forum and I hace a question on the ww2 airborne artillery units.

I have 2 rare shoulder titles one ANTI-TANK ARTILLERY and one RA ANTI-TANK

I believe that both were worn by the 2n Air-Landing Anti-tank battery of the 1st airborne division.

Can any one tell me explain the difference are they from a different time period or otherwise?

Thanks
Jean-Baptiste