Hey, H,
I personally think both the coins are pennies tbh! You have been majorly misled by the idea that one is a farthing, it’s ridiculous!
As for myself I feel really uncomfortable with you setting ‘expert’ against ‘expert’ to attain provenance/identity, etc.…it all sits very uncomfortably with me, personally, especially when you can’t even provide a basic weight, at nothing beyond the cost of around £15.
Speaking only for myself…I’m looking for your personal, and financially minimal commitment of weight in the future!