I don’t see any distinction made between the standard tarot that Marcello knew of and the Marziano deck in terms of either being more or less divine – standard tarot is definitely referred to as “divine” (the Marziano deck implicitly divine by way of the Celestials):
1. Marcello mentions trionfi and that they are related to divine things. (“By some chance the conversation turned to this game, which is called “Triumph”, certain cards that had been offered to me and which I give as they were given…. Thus indeed he [Scipio] affirmed that with them you might give considerations to divine things.”)
2. Marcello says, however, the deck he has is unworthy….(“But these particular cards I regarded as unworthy of so great majesty…”).
3. …but Marcello knows [how - Bianca? Decembrio was on the “inside", working for the Republic] Visconti had a special deck. (“Now I was aware that the most distinguished, illustrious Prince of Milan had thought out a certain new and exquisite sort of triumphs, being, as he was of everything, at one time the keenest in the invention of all the greatest things. I would briefly explain them now to you….”)
4. Marcello goes to extreme lengths to get Visconti’s deck [pat on the head for Marcello] (“I started to pursue it night and day, how by negotiation after the death of the former prince, I might be influential for you. Indeed, for a long time it was difficult for one book and deck of cards to be able to be found among the furniture, so much of the riches and splendours of the Duke being scattered as well as destroyed in the disturbance. And because of the difficulty of things I would not have been able to investigate and to know, in any way whatsoever, unless I had depended on the enemy himself
….” [what I have assumed elsewhere were the auctions inside Milan itself, still under the Ambrosian Republic]).
5. Marcello will send the deck via Cossa, but interestingly makes a comment that could be generic to either the known tarot of 1449 (whatever that was) or the Marziano deck: the game in either guise is new and Italian ( “revive the spirit by this new Italian invention”).
BTW: I finally found a color, quality scan of the tarot-like image that Marcello sent to King Rene's commander, Cossa again, on the eve of joining Sforza in the Milan-Venice war in 1453. The Marziano deck to Rene’s wife has to be viewed in the same light in terms of WHY it was sent - the significance of the later manuscript illumination is in the pages from Margaret King I posted in the thread Ross linked above, pasted again here for convenience’s sake: