Questions about CoreParts Nokia BL-4C Battery

I ordered this battery (item no. 12065235) for my Nokia X2-00 Retro mobile phone. The one delivered immediately is not as shown here, but black (with imprint: BATTERY PACK Li-ion 3.7V 900mAh 3.3Wh). My original NOKIA battery is grey, as shown here, and is called BL-4C (with imprint: NOKIA BL-4C 860mAh 3.7V 3.2Wh). But the size would fit. Can I now use the black battery supplied without hesitation, or do I need exactly the same specifications as the original NOKIA battery? If not, which battery should I use? Thank you very much in advance for your answer.