The value of crossing liberty gold

Occasionally I will see coins for sale that I can trace back to a NGC holder and is now in a pcgs holder in the same grade and stickered by cac. This seems to happen with coins stuck away for a long time like the twelve oaks collection.
So for 19th century liberty gold what added value would a coin get going from say NGC 63 TO PCGS 63 CAC? I know there is no precise answer and may depend on date but in general does it add 10%? 25% ? More ? My personal opinion is that the pcgs slab adds maybe 10-15% and cac 19th century gold has about a 10% sticker rate and it adds another 20-25% value when sold . So crossing and a sticker I could see adding 30-40% when sold at auction
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There's not much difference in most Liberty gold from NGC 63 to PCGS 63. On a typical MS63 $5/10/20 Lib I doubt the difference is more than 5%. They are pretty much sold sight-unseen in many cases. And maybe a sticker adds 5-10% to that at most. Now if you're talking better dates, better types, no motto coinage, CC's, very low pop coins, etc. then you might get that 20-25% difference for a MS63. If you're expecting 30-40% premiums, that's more in the range of gem Liberty gold like typical MS65 $2-1/2, $5, $10, and $20 Libs.
Thanks for the insight roadrunner. I was thinking better dates with regard to my OP
Personally I discount the price of Liberty Gold in NGC holders by one grade...so if a coin is in a NGC AU58 holder I assume it is PCGS AU55...not always right...but I've never had an NGC Liberty gold coin cross at a higher grade...
MS 63 is MS 63 especially w generics. The people who buy from my table at shows buy what they like as long as it's PCGS or NGC. It's the coin and where it falls in the grade range. Playing the holder / sticker game can be expensive. Buyers want material that is brilluant w cartwheel luster, pristine, well struck not tarnished material that looks it was run over by a truck.
When you get to grades 66 and 67 there can be a breakout in perceived values between NGC and PCGS and have seen it go either way. One needs to review the particular issue in question. Generalizations don't cut it and fail to consider coins at different parts of grade range.
Gold buyers at shows including myself seem to be buying what they can get close to melt especially if it's slabbed. A guy set up next to me at a show last week sold 20 NGC AGB coins in MS69 or 70.
Play the holder / sticker game if that is what u want spend money on but when coin goes bad in holder from reaction w atmosphere it's game over.
Most of my TPG coins are PCGS.