Differences between these two coins

Could someone help me to classify a 3-pence coin of 1920? From the Numista documentation, I am not able to distinguish between these two coins:

N#21182

and

N#2788

Thanks in advance

Hello. You're not the first.

https://en.numista.com/forum/topic121635.html

https://en.numista.com/forum/topic115322.html

https://en.numista.com/forum/topic101470.html

https://en.numista.com/forum/topic5372.html

If you have a magnetic slide and coins of about the same size and purity (.925/.500) it's quite easy to distinguish between the two.

https://www.dropbox.com/s/xzrdrwei22gdwtj/800v500a.MOV?dl=0