Your model is supposed to be in the same engine family as the DF bobbers, so they should be the same.
When you get your bike let the people know what engine code is on the block and also pictures of the carburetor would be cool.

I am seeing different specs in the EPA submitted specification for motorcycles, that information comes from the manufacturer, then information that is used to market some bikes. I would lean toward the lies being to the consumer rather then on the submitted data to the EPA? However I wonder if in some cases they are offering different configuration to consumer then what they are approved to offer?

I am not ragging environmentalist sponsor of bureaucracy, I just think some of it falls into unfair business practices as in lying.

So when they say it has 18hp then there is the obvious question; then why did you tell the EPA that it only has 14.5hp?