Very different. In your own words,Personally, although I can see Alenia's point of view in this (ex-USAF C-27Js taking away new build orders), I don't think it was a good move. Regardless of contractual obligations or exact wording, many are going to see this as Alenia not supporting their products.
It screws over the resale value to a purchaser when disposing of the aircraft after service. Who is going to pay top dollar for a used (but still very serviceable) aircraft that the manufacturer refuses to support?
Are air forces now going to start wondering if Alenia is going to screw them over when it comes time to sell their surplus C-27Js down the road?
Will it give potential M-346 purchasers pause for extra thought about the assumptions they had made regarding residual values during the life of the type?
You don't see Lockheed Martin throwing a fit every time an air force buys ex-USAF F-16s or C-130s. Bell and Sikorsky don't throw their toys out of the pram if anyone buys surplus UH-1s or U/SH-60s.
"It screws over the resale value to a purchaser when disposing of the aircraft after service. Who is going to pay top dollar for a used (but still very serviceable) aircraft that the manufacturer refuses to support? ".
Consider how many of them apply to this situation. "[A]fter service" - does not apply, since they haven't been in service. "sed" - ditto. They are unused. If they were normal used aircraft, that had been in service, there would be no problem.
In this case, the USA is proposing to sell new, unused aircraft which it bought at a discounted price based on an undertaking to buy a much larger number.
Alenia is not threatening to withdraw support from any other aircraft, & is happy to support used aircraft which are sold on, for example the ex-AMI G.222s bought by the USA for the Afghan air force, which were refurbished by Alenia & are now supported by it. Ditto other Alenia-built second hand aircraft.
This is a very special case. I can't imagine any other customers imagining that a similar sanction would be applied to them. Why would it? Who else is likely to negotiate a price with Alenia on the basis of buying 145 aircraft, then cut it to 21 at the same price, which it immediately tries to sell in competition with new-build aircraft?
I've never heard of anyone else pulling the same trick, or the USAF doing it before this, so LM et al have never had any reason to complain.