The Amana 2 stage HP, is not a Goodman product.
Goodman doesn't have a 2 stage 4 ton unit in split systems.
They are not the same product.
But you can always get a price on a York Affinity 15 SEER 2 stage heat pump.
They have an 18 SEER also, but you won't save enough in 20 years to pay for it.