Are there different versions of the Hog 3/DP2000?

I am going to purchase a used Hog 3. Are there different versions of the Hog 3 or DP2000? I'm not talking about the software, I'm talking about the hardware. Are there Hog 3/DP 2000's with faster processors or updated goodies?
Thanks,
Richard

PS Anything else to look for when purchasing a used Hog 3?
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