1. Those posts are very confusing at least for me -
2. no offense intended, truly
3. There is no separate price for my individual park ticket. We have a package.
4. Even Disney customer service said that.
5. Still, yes, I can do the math (divide up our package price, and park days)
6. but it doesn’t work out to the same $ as if i just add a day on a theoretical ticket only reservation for my dates.
Setting all that aside, it’s preposterous that Disney can’t at give me a quote as to the cost difference
1. I have to be very specific about which kind ticket you have in order to be accurate.
2. OK, thanks.

3. I address package tickets in post #6 in the TICKETS sticky. I specifically mention them.
Package tickets are "worth" the exact same amount as if you had bought
your ticket, stand-alone, on-line from Disney.
4. You were talking to a CM who likely has no training regarding these things.
5. If you will read post #6, nowhere does it say to do that kind of math.
6. That's because the charges don't work that way.
Let me see if I can make it more clear.
Below is excerpted from post #6 in the TICKETS sticky:
--------------------------------------------------
Ticket bought from an Authorized Reseller/Discounter:
-or-
Ticket bought as part of a WDW Resort Package:
-or-
Ticket bought at a
Disney Store:
A __ Created BEFORE Feb.12,2017 - (2016) Prices HERE.
B __ Created BETWEEN Feb.12,2017 & Feb.11,2018 (2017) Prices HERE.
C __ Created BETWEEN Feb.11,2018 & Oct.16,2018. (Early 2018) Price list HERE.
D __ Created BETWEEN Oct.16,2018 and March 12, 2019. (Late 2018) (Price list unavailable.)
E __ Created ON and AFTER March 12,2019. (2019) Price list HERE.
_________________________________________
A __________
Find the full Disney price for the kind of ticket that you HAVE on the 2016 Price list HERE.
Subtract that 2016 price from the current 2018 full Disney price for the kind of ticket that you WANT. 2018 Price list HERE.
Pay that difference price for the upgrade.
B __________
Find the full Disney price for the kind of ticket that you HAVE on the 2017 Price list HERE.
Subtract that 2017 price from the current 2018 full Disney price for the kind of ticket that you WANT.2018 Price list HERE.
Pay that difference price for the upgrade.
C __________
Find the full Disney price for the kind of ticket that you HAVE on the early 2018 Price list HERE.
Subtract that early 2018 price from the current full Disney price for the kind of ticket that you WANT on the current late 2018 Price list HERE.
Pay that difference price for the upgrade.
E __________
Find the full Disney current 2019 price for the kind of ticket that you HAVE on the
2019 Price list HERE.
Subtract that 2019 price from the current full Disney price for the kind of ticket that you WANT on the (same)
2019 Price list.
Pay that difference price for the upgrade.
__________________________________________
Restated:
Subtract the price of the ticket that you HAVE from the price of the ticket that you WANT.
Pay that difference price for the upgrade.