3 NGC 70's 06 proof buff + 07 platinum 25$ + $50$. Should I take chance of possible downgrade???

I got 06 proof gold buff and 1/4 oz plat 07 and 07 1/2 oz regular bullion issue NGC 70's. Should I take a chance of downgrade and try the cross. thx
my EBAY items
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Successful forum transactions: jessewvu, nankraut, tootawl, levinll, mistercoinman, metalsman, adamlaneus, chuckc, fivecents, kingplatinum, jdimmick, waterzooey, moderncoinmart, bige, steelielee,
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I like gambling, it's certainly more fun than playing the lottery.
It's my understanding that a PCGS MS69 is equivalent to an NGC MS70 on bullion.
Successful forum transactions: jessewvu, nankraut, tootawl, levinll, mistercoinman, metalsman, adamlaneus, chuckc, fivecents, kingplatinum, jdimmick, waterzooey, moderncoinmart, bige, steelielee,
Well, just Love coins, period.