Got this response from Castrol Customer Service.
Castrol Contact Centre <firstname.lastname@example.org>
6:43 AM (4 hours ago)
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This ticket has been updated by IC - Castrol Representative
Thank you for contacting Castrol.
The Castrol GTLMA brake fluid has been renamed to the Castrol Brake Fluid Dot 4. The packaging and the name have changed but the product is the same.
Castrol's line of Trasnsmission fluids, Gear Oils, Greases and Brake Fluid underwent a name change to align the products with some of the European products but the products remain the same.
Castrol Brake Fluid Dot 4 combines both DOT 3 and DOT 4 performance and exceeds both specifications.
Castrol Consumer Relations