Norwegian Navy will never let any country build the same frigate as Norway. for Norway it will be the same as declaring war... on them. Norway would also never sell something that advance ship to a country as Columbia.
The only problem that this is AU, so for whatever it means, maybe Norway doesn`t even exist in this AU universe, so an "un-existent" entity, can`t say anything about it.
Besides, for real world, that Norwegian frigate, is actually Spanish-made and they can sell it to whomever they want to. In fact, they have offered it to many nations as an alternative to the F-100 (that they also build), and in any of those offers to other countries, they have asked for Norway's opinion on the issue.
In relation to the USA equipment it has, you may have a point (reasons why many nations that were offered the design, ended not accepting the Spanish offer)
Yeah they have offered the design. But not the actual the same design as the Norwegian frigate. They used it just as an presentation, If someone are going to by a frigate like the Norwegian one they would be totally different! And I know this. I had a talk with my stepfather and asked him about it.
He told me that in the building contract there is a surplus line that state: "The Fridtjof Nansen class frigate can't be sold to any Nation than Norway, "But" the design basis can be used for developing a new frigate on the same design, that frigate must not share any design features that is the same as the Norwegian Frigate, except a few design features and standards."
He said the hull is Spanish, so they can do whatever they want. The SPY-1 mast layout from the Fridtjof Nansen class frigate can also be used on a new design. but after that things have to be changed. For example how compartment are placed, weapons, Kevlar placement, CIC placement, etc. This is to prevent that other that Norwegian Military personnel and designers know how her "weak points"
And for US equipment, Norway have not only got equipment that other navy can get, but they have also got some equipment under the table (after what I know and understand)!
But the other part is that this frigate is designed to be fully operational and seaworthy at full military equipment and more than 300 tons of ice on deck!
So there is many factors: yes they can sell the basic design but not the totally copy of the Norwegian frigate design. (put it in a copy machine design also) this is what I am about. If you are going to use this design you need to do some change on here. (the basic design would be: Hangar placement, funnel placement and SPY-1 mast at the same place. And also the same hull... rest would be different.)