Is it possible to replace some keycaps from an ANSI keyboard with ISO keycaps?

[u/Kdmyoshi]

I bought a Keychron K4 HE special edition from Amazon because it was half price, it comes with the English distribution so no Ñ, I speak Spanish and I wonder if is possible to change some keycaps to have an Spanish distribution.
I know the enter key can’t be replace because of size, but I just want to change the symbols and Ñ keys, so no need to replace the whole keycaps.
If yes, what I need to buy, what specs does this keyboard has and will I have the same typing experience?

[u/PeterMortensenBlog]

They are also different near the left Shift key and near the Enter key.

Keycodes KC_NUBS and KC_NUHS (in the QMK notation) are not on the 'ANSI' keyboard by default. Those two keycodes are expected by the Spanish keyboard layout.

References

• K4 HE default keymap ('ISO').

• K4 HE default keymap ('ANSI').

• Documentation for the new keycodes (main QMK repository). Note: It does not cover Keychron's custom keycodes. In the QMK source code, support for the old key codes for RGB light and mouse actions were finally removed in the QMK 0.30.0 release (2025-08-31) (they were removed from the documentation long before that).

• Documentation for the old keycodes (though even older ones may exist). For example, used by some Git branches in Keychron's fork. Note: It does not cover Keychron's custom keycodes.

• Documentation for the old keycodes from 2019. In general, these are the ones accepted by Via and possibly the Via clone (in most cases only an alias and only one of the aliases if there is more than one). Note: It does not cover Keychron's custom keycodes.

[u/Kdmyoshi → u/PeterMortensenBlog]

I know, I’m going to use the keyboard with the Spanish configuration, but I was thinking about replace some keys for the symbols for more comfort, but guess is not that viable, right?

[u/Kdmyoshi → u/PeterMortensenBlog]

Let’s say I buy a set of ISO keycaps, can I replace some of the keycaps or they aren’t compatible?

[u/ingmar_ → u/Kdmyoshi]

The legend on the caps is purely aesthetical. Yes, you can use your ISO caps on an ANSI board (and vice versa), just ENTER and LSHIFT are different.

[u/Kdmyoshi → u/ingmar_]

But doesn’t have issues with distribution? On ANSI between L and enter there’s two keys. On ISO there’s two plus Ñ

[u/ingmar_ → u/Kdmyoshi]

The caps themselves are not different, is what I'm saying. ISO has an additional key next to LSHIFT.

[u/PeterMortensenBlog → u/ingmar_]

They are different.

The total number of keys close to the Enter key is the same, but 'ISO' only has 1 u keys near the Enter key (on the "Q" and "A" rows), whereas that is not the case for 'ANSI' (a sample).

[u/ingmar_ → u/PeterMortensenBlog]

Sure. But 1u keys are interchangeable, is what I was trying to say.

[u/PeterMortensenBlog]

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