They are the same pedal with different cosmetics.
I remember reading a post by someone from catalinbread saying the circuit is the same, only the appearance has changed.
That was stated when it first came out. However that was overturned as the official statement later on. There were tweaks made.
I'm so happy with my original Fn5, I'm not missing anything like "bigger, lusher and more dynamic".
Also might want to check out the Wampler Tweed 57Hi,
... really like the tweed sound...
Also might want to check out the Wampler Tweed 57