What CRA score is PG? [transunion] [different places]

Which model is based on PG? What is myFICO?
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nIch seriously get different opinions from different places. Here's what I get: (myFICO through) 643
nTRANSUNION::
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nMyFICO 613 (ouch)
nPG: 633 (from 632 to yesterday!)
nEQUIFAX: 658 (order from a report I received in the mail yesterday from their website)
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nWas is “right”?

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Reply:No, it is not a FICO score. It is a PG score based on EQ…for whatever that is worth. It may help show trends and the results of different actions on your account, but that is probably about it.

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Reply:The score you get on PG is based on your equifax report but it's calculated by PG and not EQ and I don't think it's really a FICO score.

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