So, between your coin and the others like Richard's, Paddy's, and the 49 others I looked at I didn't notice a difference in the lighthouse. Instead, the main difference was the fingers on the trident. The list of similarities I shared in my last post are identifying features between your coin and the single coin I found (1 of 50). These two appear to be the same, showing the same finger configuration and arrangement.
The list of die markers possibly confirms that these two coins are from the same die. However, I don't know why the fingers look different on these two coins compared to all the rest. Could it be explained by something as simple as die wear or deterioration causing the deformed fingers seen on the majority? I don't know enough to say for sure. Hopefully, a member with more knowledge can offer some insights into the cause of this feature. Either way, I'm pleased you are happy with it!