That's odd. They list the same injector for NA applications. That can't be right.
I looked them up on IMC, and it's the same thing.
I've never heard of a 14X being suggested for anything: ever.
If you have a true turbo with LDA, then get the NA11X. That injector is for early turbo applications up to 1984 (CY code engines). They should pop at 155 Bar and work for your turbo pump. Also, they're A LOT cheaper than the NA14X (on IMC, they're half the price). Or, take your old injectors to your local diesel shop and have them rebuild them for about the same price.