Then it originated in the Senate. I see your point, but if only the number is the same, or if the same tax and spend portions were not in the house bill, this method would seem to severely violate the intent of the constitution.
I would tend to agree with you, especially on the intent, but Congress has been doing this with legislation for decades, I doubt it would make it past the first gate in any kind of challenge, due to the fact that the Constitution specifically allows Senate amendment, even if that amendment strikes the initial language. The parliamentarian does not block it or object to the procedure.