Metallic pads for Shimano GRX BR-RX400?

Seeing as these calipers all seem to be somewhat identical and L03A is mentioned here:https://bike.shimano.com/en-EU/product/component/ultegra-r8000/BR-R8070-R.html I’m pretty sure the metal options mentioned there (K04S Metal, L04C Metal) also work in the RX400 calipers. No guarantees though but might be worth checking out (and report back on here)

I thought of using metalic, but I've heard they are noisier.  As the organic worked fine for me, I stuck with that. What problem are you trying to solve going to metalic?

Their website seems to be down as my links are not working to the product page, but the page above gives the cross references you need.

In my case I have these options:
Pad_Option K02S-Resin, K04S-Metal
Pad_Standard L02A-Resin, L04C-Metal