Cache Preloading for Multi-Currency Setup

I’m configuring WP Rocket, I want to preload the cache for each currency variation using the wmc_current_currency cookie so that users experience fast load times when switching currencies.

I’ve noticed that every time a user changes the currency, the wmc_current_currency_old cookie is also generated, which seems to store the previous currency.

My questions are:
Does the value of wmc_current_currency_old actually affect the page content, or is it just internal data for currency switching?
To ensure fast loading, is it enough to preload the cache with wmc_current_currency, or should I also include wmc_current_currency_old?

I want to avoid storing unnecessary cache while making sure each currency has its correctly preloaded version to improve performance.

I need to configure it with this plugin: https://github.com/wp-media/wp-rocket-helpers/blob/master/preload/wp-rocket-preload-dynamic-cookies/wp-rocket-preload-dynamic-cookies.php

Thanks.

Regards,

Marcos