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I think you are referring to the Regional/God & Event/Story/Seasonal Special Packs.....not the Tiered Offers.
The Tiered Offers only come around a few times a year & you purchase the Tiered Offers with gems.
The Regional/God & Event/Story/Seasonal Special Packs are the ones that are constantly changing & you purchase the Regional/God & Event/Story/Seasonal Special Packs with real money.
If you purchase the Regional/God & Event/Story/Seasonal Special Packs via the Portal they will be cheaper....than if you purchase via mobile app.
If you purchase the Regional/God & Event/Story/Seasonal Special Packs via the Portal you will receive additional free gems.....than if you purchase via mobile app.
Check out the relevant Wiki links in relation to the different levels of Regional/God Special Packs that are available to purchase with real money.
https://wiki.diggysadventure.com/index.php?title=Special_Regional_Packs
Unfortunately the relevant Wiki page for the Event/Stories/Seasonal Special Packs hasn't been updated for a long time now.
However if you purchase an Older Story....I'm fairly sure that the Event/Stories/Seasonal Special Packs are still the same.
https://wiki.diggysadventure.com/index.php?title=Time_Limited_Offer_Equipment
If you play via PC through either the Portal or Facebook....you can download the DAF2 extension for your browser....which shows all of the different Regional/God & Event/Story/Seasonal Special Packs available.
If you want to change the Regional/God & Event/Story/Seasonal Special Packs you have been offered.....you will need to contact Pixel support directly & request they change it for you.