Same Airpods, different case.

Re: Same Airpods, different case : What is the problem?

Thank you for describing the situation!

Seems you have not yet "set up" the AirPods after adding the replacement case:

See Apple Support's article below for the steps to follow on how to:

Set up your replacement AirPods or charging case - Apple Support

Hope this works for you :-)

Re: "I tried the solution you provided but when I opened the case it was green.

Do I just leave it on charge until it goes orange".

As things seem to be not working as one would expect using the correct method, maybe do some more checking (see below)

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Re: "I’m using the AirPod A1938 model"

Wondering which AirPods model are you using with the A1938 case ... ie: are the AirPods and the case a compatible combination.

Eg: Identify your AirPods - Apple Support

says: A1938 model case:

✽ works with AirPods (2nd generation) and AirPods (1st generation)

✽ the serial number is on the underside of the lid.

✽ You can check if the case is genuine, or generates an error message online:

Enter serial number: Check Your Service and Support Coverage - Apple Support

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Re: "When I try to pair I get the "not your airpods" message"

✽ Has the previous owner of the case removed it from their Apple ID:

(AirPods can be paired with only one Apple ID at a time.)

See: Before you sell, give away, return, or recycle your AirPods - Apple Support