Transfer international eSIM to new iPhone

I'm based in the US, and have an iPhone 14 with dual eSIMs – one of these is my regular US number, and the other is for “Country A” where I frequently travel and find it useful to maintain a number for. Both of these eSIMs are working correctly. I'm considering upgrading to a new iPhone, and wish to transfer both eSIMs. My understanding is that eSIMs have to be activated in their country of origin (i.e. you cannot enable it for the first time when you are roaming). Certainly, my US eSIM was originally set up in the US, and the overseas one in Country A. Does anyone know if this is required to be the case? (If not, the rest of this question may be moot.) Both networks support the eSIM Quick Transfer feature . Apple says: >With eSIM Quick Transfer, you can transfer your phone number from your previous iPhone to your new iPhone without contacting your network provider. Does this also apply when you are currently roaming? Worst case, if there's an issue with the US one, I can contact them and work with them. Should the international one also work? I don't know whether this is more the equivalent of transferring the existing eSIM (analogously to moving a physical SIM between devices), or whether it's more like setting up a “new” eSIM which might require me to be in Country A.