Basically, it both (or more) Hirelings are own by the same character, it will apply to all of them (excluding Hireling Dresses Service).
From Tibia Manual (with the focus on the bolded parts):
Hirelings
Get your very own NPCs and put them in your house. Every character can own up to 10 hirelings.
- Hireling Apprentice: If you purchase a Hireling Apprentice, it will greet you and your guests and sell you some basic items. At purchase, you will be able to select your hireling's gender and choose a name. Make sure that the name does not violate the Tibia Rules or you risk a punishment. In such cases, your hireling will be renamed automatically with some randomly generated name.
- Banker: If you purchase the apprenticeship Banker, all of your hirelings purchased by the same character will allow you access to your Tibian bank or guild bank account with all known functionalities.
- Trader: If you purchase the apprenticeship Trader, all of your hirelings purchased by the same character will sell and buy all those items which are also traded in Tibia's cities. Moreover, it offers the assortment of the Tibian post clerks.
- Steward: If you purchase the apprenticeship Steward, all of your hirelings purchased by the same character will give you access to your supply stash.
- Cook: If you purchase the apprenticeship Cook, all of your hirelings purchased by the same character will cook useful food in exchange for a fee.
Hireling Dresses
Give your hirelings a special look by purchasing one of these cool outfits. Note that the number of your hirelings that can wear the same outfit depends on the amount of outfits you own, e.g. if you like to have two hirelings to wear the same outfit, you have to own this outfit twice.
Source: https://www.tibia.com/gameguides/?subtopic=manual§ion=products#houses
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