Hi Michal,
Glad to get your message.
Yes, the active backplate BP-VG4090AST-BKP is not compatible with BP-VG4090AST-V2. It only fits BP-VG4090AST. You can pre-order BP-VG4090AST now, which will be available in about 2-3 weeks.
https://shop.bitspower.com/index.php?route=product/product&product_id=8340&search=4090ast