I found the title screen sprites with an Expanded Akumajou Dracula (SFC) ROM expanded with SC4ED
The title screen is located at 0x27D800 as you can see here:
What other changes are required to "localize" Akumajou Dracula into SCIV?
I mean no japanese characters nor "Belmondo" or anything like that?
AFAIK we only need to convert the title screen to a proper "Super Castlevania IV" one, and change the gravestone that reads "DRACURA" to "DRACULA"
Anything else I might be missing?
If someone has the time, try opening both Akumajou Dracula and Super Castlevania IV Expanded ROMs, and try to fetch the title screen from the USA ROM into the Japanese ROM to see how it looks like.
Or maybe even a custom title screen would be nice too.