[Q] How to apply icon pack to custom apps?

I've just downloaded an icon pack and used KKlauncher to install the theme.
Most of my apps in the drawer become the same style as the icon pack but still some of the apps remained unchanged.
e.g. Whatsapp+, custom camera apps
Is it possible to apply the icon pack to the rest of the apps?

Please help and sorry for my poor English.

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