What changed between J-480 and J-475

[marcel]

I am noticing that the new J-475 has an identical layout to the J-480 which is still being sold (and a discount).

If i look at the specs I can get my hands on, I don't see many changes.
So what are the improvements on the J-475, or is just re-marketing and nicely priced J-480 would be viable alternative?
Thinking energy usage, isolation, jets.

Curious if anyone knows.

Thanks

Marcel