SRAM Guide RSC spares

Are SRAM Guide RSC Gen2 lever spares compatible with older models? If not, then where could I find spares for a 2015 model? I can only find Gen2 spares wherever I search.

This one here seems to be what I need:
https://www.pure-bike.co.uk/lever-internals-for-guide-rsc-ultimate-code-rsc
(Sram Guide RSC A1-B1 2015-2018)
Sram part number : 11.5018.005.010

It is matching with the reference number of this:
https://www.bikeinn.com/bike/sram-rec-kit-piston-maneta-guide-rsc-g2/136634150/p?utm_source=google_products&utm_medium=merchant&id_producte=5878576&country=uk&gclid=Cj0KCQiA_rfvBRCPARIsANlV66PeKQfCIzCKYBHW9y_OqRG2pY0VCPJ8JIFLVMD5EuEyLCRe42eglmkaAk1OEALw_wcB&gclsrc=aw.ds

Bikeinn customer service said that it is compatible with Gen2 only. I am very confused now.

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