They are definitely separate types, however, if you got your 1900 type before a specific date (which I am not 100% sure of) I believe that it may be transferrable between the 2 types. The difference in systems, I am told, is neglegible.
The date when the types were separated is sometime in 1991, when the 1900D came out. The thinking is; the 300-350 are very similar, and the 1900 was only slightly different. Then the 1900D was just a little more distanced from the rest. Suddenly, they figured that it was too much of a difference from the 300 to the 1900D.
This what I was told at FSI. However, I like flit4xx's explanation better because: IT'S ALL A BIG CONSPIRACY!!!
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