Unless it's a coincidence, 'normal' 3490 latest firmware is also V8.20, so if it's running the same fw and is hardware identical there won't be a lot you can change. Earlier model BMW branded Garmins did have some differences in the cradle for instance. If you're only wanting to change the Start Up Logo, that's no problem but first ensure your unit's HWID is 1376 before using the pack in Post #1.

PS: I've removed the Unit's Identification Number from your image to protect you.