Is my replacement iPhone still covered under my AppleCare?

See this link which includes the following statement --> Transfer your AppleCare plan - Apple Support:

If you receive a replacement device

If we replace your device instead of repairing it, we’ll automatically transfer your plan to your new device. If transfer of coverage isn’t possible, we’ll offer other options.

Enter your serial number here:

Check Your Service and Support Coverage - Apple Support

You can find it here:

Find the serial number or IMEI on your iPhone, iPad, or iPod touch - Apple Support

The replacement phone will be covered under the remainder of your original warranty or 90 days, whichever is longer.